Select the most appropriate option that can substitute the underlined segment in the given sentence.
If you are thinking about investing in share markets, isn’t it make sense to find an expert?

The correct answer is doesn’t it.

Explanation:

In the given sentence, the verb phrase following the subject is "make sense" (a base verb). We need an auxiliary verb that agrees with the singular pronoun "it" in the present simple tense to form a question.

1. The auxiliary verb "is" (from "isn't it") is followed by either an "-ing" form (present continuous) or a past participle (passive voice). Since "make" is in its base form, "isn't it" is grammatically incorrect.

2. To form a negative simple present question with the singular subject "it", we use the auxiliary verb "does not" or its contraction "doesn't".

3. Therefore, "doesn't it" correctly precedes the base verb "make" to form the phrase "doesn't it make sense".

Corrected Sentence:
If you are thinking about investing in share markets, doesn’t it make sense to find an expert?