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 100+ points GMAT score improvement guarantee

The best guarantee you’ll find

Our Premium and Ultimate plans guarantee up to 100+ 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

Over time, weightlessness causes medical problems in astronauts, such as the deterioration of the spinal cord, so astronauts are advised to train rigorously in order to avoid it.

This answer choice is redundant as a result of adding the words a long period of. These words also change the meaning of the original sentence. 

Well done! Although this answer choice is stylistically flawed as the pronoun it is ambiguous, it is the best of the five answer choices.

The three answer choices that correct the stylistic mistake, namely, the ambiguity, are grammatically incorrect or illogical. 

Remember that unlike grammatical mistakes, which must always be corrected, stylistic mistakes, namely, redundancy and ambiguity, are not always corrected.

Therefore, If you don't find a perfect answer choice and have to choose between a grammatically incorrect answer and a stylistically flawed one, choose the latter.

While this answer choice corrects the original ambiguity mistake, it is grammatically incorrect. Replacing the singular verb causes with the plural cause creates a Subject Verb Agreement mistake.

While this answer choice corrects the original ambiguity mistake, it is grammatically incorrect. Replacing the plural noun astronauts with the singular astronaut creates a Subject Verb Agreement mistake.

While this answer choice corrects the original ambiguity mistake, it is illogical as a result of replacing the conclusion word so with the opposition word but.

Over time, weightlessness causes medical problems in astronauts, such as the deterioration of the spinal cord, so astronauts are advised to train rigorously in order to avoid it
Over a long period of time, weightlessness causes medical problems in astronauts, such as the deterioration of the spinal cord, so astronauts are advised to train rigorously in order to avoid it

Over time, weightlessness cause medical problems in astronauts, such as the deterioration of the spinal cord, so astronauts are advised to train rigorously in order to avoid such backbone deterioration

Over time, weightlessness causes medical problems in astronauts, such as the deterioration of the spinal cord, so astronaut are advised to train rigorously in order to avoid such backbone deterioration

Over time, weightlessness causes medical problems in astronauts, such as the deterioration of the spinal cord, but astronauts are advised to train rigorously in order to avoid such backbone deterioration