If a body falls with terminal velocity then

Explanation

At terminal velocity, the force of gravity acting on the body is balanced by the drag force, resulting in no net force. According to Newton's second law, if there is no net force, there is no acceleration. Therefore, the correct answer is a = 0. Option B is incorrect because the acceleration due to gravity, g, does not become zero; it is a constant at approximately 9.8 m/s2. Option C is incorrect because it states that both a and g are zero, which is not true. Option D is incorrect because it suggests that neither a nor g is zero, but in reality, a is zero at terminal velocity.