Anderson and his lab partner each held a tuning fork, 4440 hz, in their hands. anderson tapped his tuning fork with a mallet and they listened to the sound it made. "wait a minute! " exclaimed anderson's partner. "my tuning fork is vibrating too! " sure enough, both tuning forks were vibrating although only anderson hit his with the mallet.

what wave property caused the second tuning fork to vibrate?
a) diffraction
b) interference
c) refraction
d) resonance