CPI/GDP question help, plox

Appears our teachers use the same questions as the earlier anon who posted an economics question on AS curve. Anyway:

When CPI decreases what happens to real GDP?



 a. Increases

 b. Decreases

 c. Stays the same

 d. CPI doesn't impact real GDP


I want to say A since I was pretty sure they have a negative relationship, but I've seen several different answers on Yahoo answers, where gurl gits praegnant. Help plox?

Do they honestly ask multiple answer questions in American schools? Seriously?