Topic: Pronoun (সর্বনাম),

Best Answer Explained in Below-:

The sentence "When friends insist on __ expensive gifts, it makes most people uncomfortable" requires a noun phrase after the preposition "on." Let's analyze the options provided:

A) "them to accept" – This option does not work because "them" is an object pronoun and does not fit grammatically after "on."

B) "their accepting" – This is the correct choice as it uses the gerund form "accepting," which functions as a noun. Here, "their" acts as a possessive pronoun, indicating that the act of accepting gifts belongs to the friends.

C) "they accepting" – This choice is incorrect because "they" is a subject pronoun and cannot follow "on," which requires a noun or gerund.

D) "they accept" – Similarly to option C, "they" is a subject pronoun, making this choice grammatically incorrect for the same reason.

In summary, "their accepting" properly fits the syntax of the sentence, allowing the reader to understand that the discomfort arises from the friends' action of accepting expensive gifts. This makes it the most appropriate option grammatically and contextually.