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Sentence Correction: Parts of Speech - Adverb

The mastering process, crucial for the production of music albums, is a step in which the producer and sound technicians patiently adjust the volume levels across the audio spectrum.

Incorrect.

This answer choice is stylistically flawed. It contains the wordy phrases Sound technicians along with and patiently make adjustments to the volume, which are redundant and can be made more concise.

Incorrect.

This answer choice is grammatically incorrect. An adverb should be used to describe a verb. In this sentence, an adjective (patient) is used to describe a verb (adjust).

Incorrect.

This answer choice is grammatically incorrect. The plural subject producer and sound technicians does not agree with the singular verb adjusts.

What helps us identify this question as a Subject Verb Agreement question is the following Stop Sign:

plural subject built of singular nouns connected by and

Incorrect.

This answer choice is grammatically incorrect. the article "the" before "producing" indicates that a real noun needs to be used, instead of the Verb+ing (producing). Since there is a real noun -production  - it should be used.

More importantly, removing the verb "is" from the sentence creates a fragment - a clause without a conjugated verb. There simply is no indication what the mastering process....does?

Excellent!

This answer choice correctly uses an adverb (patiently) to describe a verb (adjust).

The mastering process, crucial for the production of music albums, is a step in which the producer and sound technicians patiently adjust the volume levels across the audio spectrum
Crucial for the producing of music albums, the mastering process, a step in which the producer and sound technicians patiently adjust the volume levels across the audio spectrum
The mastering process, crucial for the production of music albums, is a step in which the producer and sound technicians patient adjusts the volume levels across the audio spectrum 
The producer and sound technicians adjust patient the volume levels across the audio spectrum during the mastering process, a crucial step in the production of music albums
Sound technicians along with the producer patiently make adjustments to the volume levels across the audio spectrum during the mastering process, which is a crucial step in the production of music albums