Don’t lose your progress!

We cover every section of the GMAT with in-depth lessons, 5000+ practice questions and realistic practice tests.

Up to 90+ points GMAT score improvement guarantee

The best guarantee you’ll find

Our Premium and Ultimate plans guarantee up to 90+ points score increase or your money back.

Master each section of the test

Comprehensive GMAT prep

We cover every section of the GMAT with in-depth lessons, 5000+ practice questions and realistic practice tests.

Schedule-free studying

Learn on the go

Study whenever and wherever you want with our iOS and Android mobile apps.

The most effective way to study

Personalized GMAT prep, just for you!

Adaptive learning technology focuses on your academic weaknesses.

Sentence Correction: Pronoun Questions - Ambiguity

First used on a film set in 1976, the Steadicam is a device that attaches to a harness and encases the motion-picture camera in a carefully balanced armature, so that it facilitates more fluid movement and enabling the flexibility of hand-held shooting, while producing a more stable image.

Incorrect.

This answer choice is grammatically incorrect. The construction A and B (facilitates and enabling) requires that A and B belong to the same part of speech. In this case, A (facilitates) is a conjugated verb, whereas B (enabling) is a non-conjugated verb.

[[snippet]]

In addition, the pronoun it is ambiguous, as it could refer to any of the singular nouns in the preceding part of the sentence (device, harness, camera, armature). 

Incorrect.

Although this answer choice corrects the ambiguous pronoun mistake in the original sentence, this answer choice repeats the Parallelism mistake and even introduces a new one. 

The construction A and B (facilitates and enabling) requires that A and B belong to the same part of speech. In this case, A (facilitates) is a conjugated verb, whereas B (enabling) is a non-conjugated verb.  In addition the construction attaches...and encasing violates the parallelism in the first part of the sentence.

[[snippet]]

Well done!

This answer choice corrects the Parallelism mistake in the original question by changing the phrase so that it facilitates, which uses a conjugated verb, with the non-conjugated verb facilitating in order to be parallel to enabling and producing.

Incorrect.

This answer choice repeats the Parallelism mistake in the original question and is stylistically flawed. The construction A and B (facilitates and enabling) requires that A and B belong to the same part of speech. In this case, A (facilitates) is a conjugated verb, whereas B (enabling) is a non-conjugated verb

[[snippet]]

In addition, the phrase by doing so is wordy and redundant. The same meaning can be expressed more concisely.

Incorrect.

This answer choice is grammatically incorrect. The construction A and B (facilitate and enabling) requires that A and B belong to the same part of speech. In this case, though both verbs are non-conjugated, A (facilitate) is a to V form, whereas B (enabling) is a V+ing form.

[[snippet]]
encases the motion-picture camera in a carefully balanced armature, so that it facilitates
encasing the motion-picture camera in a carefully balanced armature, so that the device facilitates
encases the motion-picture camera in a carefully balanced armature, and by doing so facilitates
encases the motion-picture camera in a carefully balanced armature, so as to facilitate
encases the motion-picture camera in a carefully balanced armature, facilitating