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Sentence Correction: Sentence vs. Clause vs. Fragment

The world's most commonly cultivated tetraploid potato species is solanum tuberosum, from which derive both the andigena and the tuberosum subspecies.

Well done!

This answer choice correctly matches the singular verb is with the singular subject species and matches the plural verb derive with the plural subject the andigena and tuberosum subspecies.

Incorrect.

This answer choice is grammatically incorrect. The plural verb are does not agree with the singular subject species.

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Incorrect.

This answer choice is grammatically incorrect. The singular verb is does not agree with the plural subject the andigena and tuberosum subspecies.

[[snippet]]

Incorrect.

This answer choice is grammatically incorrect. The phrase as well as is considered non-idiomatic on the GMAT. The correct idiom is both A and B.

Incorrect.

This answer choice is grammatically incorrect. The plural verb are does not agree with the singular subject species.

In addition, by changing from which derive to and derived from it, the corrected sentence creates a fragment, as the conjugated verb derived lacks a subject. We can see that the sentence is a fragment, because the sentence does not provide an answer to the question "who/what derived?"

is solanum tuberosum, from which derive both the andigena and the tuberosum

are solanum tuberosum, from which derive both the andigena and tuberosum

is solanum tuberosum, from which is derived both the andigena and tuberosum

are solanum tuberosum, and derived from it both tuberosum and andigena

is solanum tuberosum, from which derive the tuberosum as well as the andigena