In outer space, a ball thrown in a frictionless environment will continue in a straight line forever, and the reaction to car tires pushing on the road is the road pushing back on the tires.
In a frictionless environment such as outer space, if you let go of a ball according to Newton's first law of inertia, the ball will travel in a straight line forever unless acted upon by an outside force. So, the correct answer to the first question is (a) it will travel in a straight line forever.
For the second question, when a car accelerates down the road, the reaction to the tires pushing on the road is the road pushing back on the tires with an equal and opposite force, in accordance with Newton's third law. Therefore, the correct answer to the second question is (c) the road pushing on the tires.