Institution: SONALI BANK LTD Exam: Sonali Bank Ltd - Sub-Assistant Engineer (Mechanical) - 30.09.2016 ||
Topic: Preposition, Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The correct choice for the sentence "I could not convince him ____ his mistake." is B) of. This choice is appropriate because the preposition "of" is commonly used in English to indicate possession or association with something. In this context, "his mistake" refers to a particular error that belongs to or is associated with him. When we say "convince him of his mistake," we are implying that we are trying to persuade him to acknowledge the existence or reality of a specific error he has made.

The other options do not fit grammatically or contextually. Option A) "to" suggests a direction or intention but does not convey the idea of recognition or acknowledgment of a mistake. Option C) "for" could imply a reason or purpose, which would not accurately reflect the intended meaning. Lastly, option D) "from" suggests separation or removal, which is incompatible with the concept of convincing someone of their error. Thus, "of" is the only preposition that accurately captures the relationship between the subject and the mistake, making it the correct answer.