Select the most appropriate option to substitute the highlighted segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’.
Unless she doesn’t study French carefully, she cannot get the highest marks in the class.

Correct option is D

The correct option to substitute the highlighted segment in the sentence "Unless she doesn’t study French carefully, she cannot get the highest marks in the class." is option (d) Unless she studies.
Explanation:
· The word "unless" already conveys a negative condition, so using "doesn't" creates a double negative, which is incorrect. The correct structure is "Unless she studies," which means "If she does not study."
Grammatical Rule Involved:
· Avoiding Double Negatives: In English, double negatives (e.g., "unless" + "doesn't") should be avoided because they can lead to confusion. Instead, use a positive verb form after "unless" to clearly convey the intended meaning.