I. All wheeled conveyances that travel on the highway are polluters.

(A) Bicycles do not travel on the highway. Correct (according to question all vehicles that travel on the highway are polluters and bicycles are not polluters.)

(B) Bicycles travel on the highway only if it is raining. Out of context (In the question there is no mention that bicycle travels on highway only if it is raining)

(C) If my car is not polluting, then it is not raining. Out of context (In the question there is no relation between car, pollution and rain)

(D) I am now driving on the highway. Incorrect (In the question it is given that it is raining and whenever I drive on the highway it rains. But, it is not given that whenever it rains I drive on the highway)

(E) My car is not a polluter. Incorrect (In the question it is mentioned that car travels on highway. Also, it is a wheeled conveyance.Therefore, it must be a polluter)

Hence, answer is A