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Sentence Correction: Comparatives - Like/Unlike

Jupiter and Saturn, unlike the terrestrial planets that do, do not have an actual surface, but instead consist of clouds of hydrogen compounds that increase in density the closer they are to the core.

Incorrect.

This answer choice is grammatically incorrect. The unlike section should not include a conjugated verb. In this answer choice, however, the unlike section includes a conjugated verb (unlike the terrestrial planets that do).

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Incorrect.

This answer choice is grammatically incorrect and repeats the original Comparative error. The unlike section should not include a conjugated verb. In this answer choice, however, the unlike section includes a conjugated verb (unlike the terrestrial planets do).

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Incorrect.

This answer choice is grammatically incorrect and repeats the original Comparative error. The unlike section should not include a conjugated verb. In this answer choice, however, the unlike section includes a conjugated verb (unlike the terrestrial planets that do).

[[snippet]]

Incorrect.

Although this answer choice corrects the original Comparative error by removing the verb from the unlike section, it creates a Subject Verb Agreement error. The plural subject Jupiter and Saturn does not agree with the singular verb does.

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

A plural subject made up of singular nouns connected by and

Bravo!

This answer choice corrects the original Comparative error by removing the verb (do)  from the unlike section of a Comparative sentence.

Jupiter and Saturn, unlike the terrestrial planets that do, do not have an actual surface, but instead consist of clouds of hydrogen compounds that increase in density the closer they are to the core
Jupiter and Saturn do not have an actual surface, unlike the terrestrial planets that do, but instead consist of clouds of hydrogen compounds that increase in density the closer they are to the core
Jupiter and Saturn, unlike the terrestrial planets, and consisting of clouds of hydrogen compounds that increase in density the closer they are to the core, does not have an actual surface
Consisting of clouds of hydrogen compounds that increase in density the closer they are to the core, Jupiter and Saturn, unlike the terrestrial planets, do not have an actual surface
Unlike the terrestrial planets do, Jupiter and Saturn do not have an actual surface, but instead consist of clouds of hydrogen compounds that increase in density the closer they are to the core