Answer the following question: You are presented with the quiz "A doorbell converts _ into sound" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "adoorbell converts electrical energy into sound" and "electricity is a kinetic energy". So, what's the best answer to the question?

Choose your answer from:
a). a hydraulic system
b). rays or beams
c). deoxyribonucleic acid
d). kinetic energy
e). encoded information
f). sensory neurons
g). circulatory systems
h). Loud noises
Answer:
d).