The correct answer is C.
To “put a spoke in someone’s wheel” means to hinder or obstruct someone’s plans or progress. In this case, the speaker is saying that someone deliberately tried to prevent them from achieving their goals.
Option A is incorrect because “tried to cause an accident” does not mean the same thing as “hinder or obstruct someone’s plans or progress.” An accident is an unintended event, while hindering or obstructing someone’s plans or progress is a deliberate act.
Option B is incorrect because “helped in the execution of the plan” means the opposite of “hinder or obstruct someone’s plans or progress.” If someone helped in the execution of a plan, they would be making it easier for the plan to succeed, not harder.
Option D is incorrect because “destroyed the plan” means the same thing as “hinder or obstruct someone’s plans or progress.” However, it is more specific in that it implies that the plan was completely ruined, while “put a spoke in someone’s wheel” can also mean to simply make it more difficult to achieve the plan.