Of the three ministers (A) / who do you think (B) / is going to prove ...
The given sentence is grammatically correct and does not contain any error.
Explanation:
The sentence is a simple interrogative sentence which is grammatically correct. It has three parts - subject (A), question word (B) and predicate (C). The sentence asks the person being addressed to express their opinion about the success of the three ministers.
The sentence does not contain any error in terms of grammar or syntax. Therefore, the correct answer is option C - no error.
Of the three ministers (A) / who do you think (B) / is going to prove ...
'Most' is used instead of 'more' when comparing more than 2 things.