Choose the most suitable option to replace the highlighted part of the sentence:
Students must ensure that their papers are not only coherent but they are also well-researched.
Show answer & explanation
Correct answer: B
Explanation
Correct Answer: their papers are not only coherent but also well-researched.
Explanation
• The correlative conjunction not only... but also requires parallel grammatical structure on both sides.
• Since not only is placed before an adjective (coherent), but also should be followed directly by a parallel adjective (well-researched).
• Repeating the subject and verb (they are) after but disrupts this parallelism and creates unnecessary redundancy.
Quick Tip: Always balance correlative conjunctions: not only + [Adjective] + but also + [Adjective].