Question

scientists called garbologists study waste to a understand how layers of rocks form, b learn more about what people throw away, c convince people to live near landfills, d find out how long it takes to build a landfill.

Explanation:

Garbologists study waste. Option A is about rock layers (geology), C is about convincing people to live near landfills (not related to waste study), D is about landfill construction time (not waste study). Studying waste helps learn what people discard, so B is correct.

Answer:

B. learn more about what people throw away.