Consumers' decisions affect producers' decisions.
a. true
b. false

Consumers' decisions indeed do affect producers' decisions. This is a true statement. If you're a consumer, what and how you decide to buy things will drastically affect what the producer will manufacture and what he will make. So from that perspective this is a true statement. 

The one that most represents the earths mantle would be the skin since the mantle is the upper part of the earths depths which is just like the skin of an apple.