Write the Word or Phrase That Best Completes Each Statement $B ( x )$

Multiple Choice

Write the word or phrase that best completes each statement or answers the question.
-An economist predicts that the buying power $B ( x )$ of a dollar x years from now will decrease according to the formula $B ( x ) = 0.2 ^ { x }$ . How much will today's dollar be worth in 4 years? Round the answer to the nearest cent.

A) $\$ 0.53$
B) $\$ 0.80$
C) $\$ 0.00$
D) $\$ 1.32$