It was he who put a spoke in my wheel. A. tried to cause an accident B. helped in the execution of the plan C. thwarted in the execution of the plan D. destroyed the plan

The correct answer is C.

To “put a spoke in someone’s wheel” means to interfere with someone’s plans or activities, or to make it difficult for them to succeed. In this case, the speaker is saying that someone interfered with their plans, making it difficult for them to achieve their goals.

Option A is incorrect because the speaker is not saying that the person tried to cause an accident.

Option B is incorrect because the speaker is not saying that the person helped in the execution of the plan.

Option D is incorrect because the speaker is not saying that the person destroyed the plan.