Answer the following question given this paragraph: 

Water waves, sound waves, and the waves that travel along a rope are mechanical waves . Mechanical waves require a material medium such as water, air, or rope. Light waves, however, are electromagnetic waves and travel without a material medium. They are not mechanical waves.


Q: What waves require a material medium such as water, air, or rope?

 Choices:

- light

- potential

- electromagnetic

- mechanical

A:
mechanical
