Based on Economist Richard Roll's Work, the BEST Way to Predict

Multiple Choice

Based on economist Richard Roll's work, the BEST way to predict future weather in Florida, where oranges are grown, may be:

A) to listen to meteorologists.
B) to look at the difference between futures and spot prices of orange juice.
C) to wait and see what the weather turns out to be.
D) to look at past trends in orange production.