To Locate Objects in Their Environments, Bats in Flight and Porpoises

To locate objects in their environments, bats in flight and porpoises under water both use ultrasound waves with frequencies that are beyond human hearing. These animals produce an ultrasonic wave and then detect echoes from nearby objects.If a porpoise and a bat both produce ultrasonic waves when they are 16 m from an object, which animal would hear its echo first and why?

A) The bat would hear its echo first because sound travels faster in air than in water.
B) The porpoise would hear its echo first because sound travels faster in water than in air.
C) The bat would hear its echo first because the amplitude of sound waves is greater in air than in water.
D) The porpoise would hear its echo first because the amplitude of sound waves is greater in water than in air.