What is the correct answer when the car hit the tree it made a terrible noise or the car made a terrible noise as it crashed into a tree?

The correct answer is: When the car hit a tree, it made a terrible noise. Since the object is to find the sentence with vague pronouns, it could refer to either the tree or car. It does not specify which antecedent it refers to.

* This is a poor example of a vague (unclear) pronoun because there is no noun antecedent. What is making the noise is the collision, not the tree or the car. What is making the noise is "the car hitting the tree" which is not in the sentence.