Answer the following question given this paragraph: 

Longitudinal waves, like sound waves, have compression and rarefaction zones. The compression zones are where, for example in a sound wave traveling through air, the air molecules are densely packed. The rarefaction zones are areas where the air molecules are loosely packed, like a vacuum zone. Us teachers will often draw longitudinal waves as transverse waves, but remember the difference.


Q: What is the opposite of rarefaction zones, where air molecules in waves are loosely packed?

 Choices:

- molecules zones

- pressure wave

- measurements zones

- compression zones

A:
compression zones
