__________ is not a supporting sentence of topic sentence: We owe some of our notions of radar to scientific observation of bats.
A.
Scientists noticed that bats rarely collided with anything in their erratic flight.
B.
It was found that bats keep sending out noises inaudible to people.
C.
Bats really look more like mice with wings than anything else.
D.
Keen eyesight could not be the reason for their flying the way they do, since bats are blind.