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Sentence Correction: Preposition and Idiom Questions - Overview

A preliminary study suggests that melanomas have a different appearance than other irregular skin moles, according to a report in the January issue of Archives of Dermatology, one of the JAMA/Archives journals.

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This answer choice is grammatically incorrect. The correct idiom is different from, not different than

This answer choice repeats the original Preposition mistake: the correct idiom is different from, not different than.

In addition, this answer choice creates a Subject Verb Agreement mistake: the singular subject study does not agree with the plural verb suggest.

This answer choice is grammatically incorrect: the correct idiom is different from, not different to.

In addition, this answer choice creates a Subject Verb Agreement mistake: the singular subject melanoma does not agree with the plural verb have.

While this answer choice corrects the original mistake, it does not stop there and makes another change: replacing suggests with suggesting. This creates a sentence without a verb: a sentence that begins with the subject A preliminary study but  that ends without a verb that indicates what the subject A preliminary study did. 

suggests that melanomas have a different appearance than other irregular skin moles, according to
suggest that melanomas have a different appearance than other irregular skin moles, according to
suggests that melanoma have a different appearance to other irregular skin moles, according to
suggests that melanomas have a different appearance from other irregular skin moles, according to
suggesting that melanomas have a different appearance from other irregular skin moles, according to