Answer the following question given this paragraph: 

In a transverse wave, such as a wave in a rope, the medium vibrates at right angles to the direction that the wave travels. The high points of transverse waves are called crests, and the low points are called troughs.


Q: What do you call the high and low points of transverse waves?

 Choices:

- echos and troughs

- waves and troughs

- bands and troughs

- crests and troughs

A:
crests and troughs
