The correct option is B b
Let’s examine the sentence: “The truck driver accused the lady for walking in the middle of the road.” The sentence uses the verb ‘accuse,’ which is combined with ‘of’ to form the phrasal verb ‘accuse (one) of.’ A phrasal verb is an idiomatic phrase consisting of a verb and another element, typically either an adverb, as in break down, or a preposition, for example see to, or a combination of both, such as look down on. The sentence wrongly uses the preposition ‘for’ instead of ‘of.’ Hence, the error is in part b of the sentence. So, Option B is the correct answer.