Question 2 of 10 which structure is most likely used for motion?

It's the picture of the dolphins tale or fin, whatever it's called.

In this case answer B.

Explanation:

The leaf isn't used for motion.

The tail is moved up and down etc.. and creates motion that helps the dolphin swim.

The apple isn't used for motion.

The wolf's eye is used for sight, not motion.

Thus the answer is picture B.