Can you show me how to get the correct answer?

4. The radius of a right circular cylinder is increasing at a rate of 2 units per second. The height of the cylinder is decreasing at a rate of 5 units per second. Which of the following expressions gives the rate at which the volume of the cylinder is changing with respect to time in terms of the radius r and height h of the cylinder? (The volume V of a cylinder with radius r and height h is V = mr h.) (A) -20TT = - 5 (B) 2arh DT (C) 4rrh - 5TT? 2 (D) 4mrh + 5mr2 DT IT R W