Question 4 (1 point)
Mac and Suzanne cut holes in the bottom of two cups and connect them with a string. When Mac whispers into one cup, Suzanne can hear him through the other. What is the best reason to explain why this happens?
A sound waves produce an echo.
B Sound waves travel better through solids than gases.
C Sound waves can travel great distances.
D Sound waves from whispering have a higher frequency.