Dave went to buy stamps. he had $5.00 to spend on $0.34 stamps if the function f(x)=5-0.34x describes the change dave will receive, what does the variable x represent in this situastion?

a. the amount of money that dave spent on stamps.

b. the amount of change that dave received.

c. the number of stamps that dave purchased.

d. the number of envelopes that dave purchased.