You are provided with an acceleration value for an object. You are then told that the net force is changed to twice its original value ("doubled"). You are asked to determine the new acceleration that results from this "doubling". Newton's second law states that the acceleration is directly proportional to this net force, This means that an alteration in net force would alter the acceleration value by the same factor. Thus, a doubling of net force causes a doubling of acceleration. And so your task is to take the given acceleration value and change it by this doubling factor.