The diagram below shows a boat and a scuba diver that is approximately 40 feet below the boat. The top of the flagpole on the boat is 15 feet above the surface of the water. The elevation of the surface of the water is 0 feet. Which number represents the elevation of the scuba diver?

A. –55 ft

B. –40 ft

C. 40 ft

D. 55 ft

A. –55 ft

B. –40 ft

C. 40 ft

D. 55 ft