What is the exponential function that passes through the points (0,5) and (4,3125)

A. Y=5(5)^x
B. Y=3125(4)^x
C. Y=5(625)^x
D. Y=4(5)^x

this is what i know

For a party, you can spend no more than $ 20 on cakes. The egg cake cost is $ 4 and the cream cake cost is $ 2. Write the linear inequality that models the situation. Graph the inequality. Suppose that the number of egg cakes we buy is represented by x and the number of cream cakes we buy is represented by y.