You are correct, the answer A is the correct response. Newton's Second Law of Motion states that the acceleration of a body is directly proportional to the net force acting on it and inversely proportional to its mass. Specifically, it states that the acceleration of a body tends to be in the same direction as the unbalanced force applied to it. The other options are incorrect because: B is the inverse of the correct statement, C states the acceleration is in the opposite direction which is incorrect, and D only addresses the relationship between acceleration and mass, not the direction of the acceleration.