The photo shows a veterinarian using an ultrasound machine to see inside a dog’s body
Which statement best describes how ultrasound can produce an image?
A. Sound waves that form within the body travel to the machine,
where they are detected.
B. Sound waves emitted by the machine bounce off tissues and
return to the machine.
C. Sound waves that form outside the body reflect off the body and
are detected by the machine.
D. Sound waves emitted by the machine pass through the body and
are measured on the other side.