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Parallel structures sometimes employ ELLIPSIS: the omission of words whose presence is understood.

To illustrate:
John is the fastest swimmer on the team; Mike, the slowest.
The sun was so bright, the sky so blue, that John could not wait to start the day.

The portions in red employ ellipsis. Words have been omitted, but their presence is understood. Without ellipsis:

John is the fastest swimmer on the team; Mike is the slowest swimmer on the team.
The sun was so bright and the sky was so blue that John could not wait to start the day.

Ellipsis allows for a more concise sentence, with no loss of meaning.

Here is the OA to the SC above:

So dogged were Frances Perkins’ investigations of the garment industry, so persistent her lobbying for wage and hour reform, that Alfred E. Smith and Franklin D. Roosevelt recruited Perkins to work within the government, rather than as a social worker.

The portion in red employs ellipsis. Words have been omitted (and and was), but their presence is understood. If we were to include the omitted words, the sentence would read as follows:

So dogged were Frances Perkins’ investigations of the garment industry and so persistent was her lobbying for wage and hour reform that Alfred E. Smith and Franklin D. Roosevelt recruited Perkins to work within the government, rather than as a social worker.

Be on the lookout for ellipsis if you notice the following:

-- a series of parallel structures
-- the omission of words whose presence seems to be understood

If you suspect ellipsis, hold onto the answer choice. Look for errors in the other answer choices.

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