Which sentence lists three elements with proper parallel structure?

Which sentence lists three elements with proper parallel structure?

• A. The essay requires careful research, thorough analysis, and clear writing.
• B. The essay requires careful researching, analysis, and writing clearly.
• C. The essay requires careful research, thoroughly analyzing, and writing.
• D. The essay requires careful research, thorough analysis, and writing.

Answer: (A)

Parallel structure means items in a series should share the same grammatical form. In this sentence, each element is a noun phrase formed as an adjective plus a noun: careful research, thorough analysis, and clear writing. That consistency makes the list balanced and easy to read, signaling that these three elements are of the same kind. The other options break that pattern. One uses researching (a verb form) alongside nouns, so the forms don’t match. Another mixes thoroughly analyzing (a verb form) with nouns, again breaking parallel structure. The last option starts with adjective+noun pairs but ends with a bare writing, lacking a parallel modifier, so the sequence isn’t uniform.

Parallel structure means items in a series should share the same grammatical form. In this sentence, each element is a noun phrase formed as an adjective plus a noun: careful research, thorough analysis, and clear writing. That consistency makes the list balanced and easy to read, signaling that these three elements are of the same kind.

The other options break that pattern. One uses researching (a verb form) alongside nouns, so the forms don’t match. Another mixes thoroughly analyzing (a verb form) with nouns, again breaking parallel structure. The last option starts with adjective+noun pairs but ends with a bare writing, lacking a parallel modifier, so the sequence isn’t uniform.