The Above Table Provides the Possible Prices for a Bushel

The above table provides the possible prices for a bushel of corn next year along with the associated probabilities (in percent) .
-Refer to the table above. If these are the only three price options for a bushel of corn, what is the value of A?

A) 0.30
B) 0.45
C) 0.25
D) 0.55