SAT Math (Exponential Decay)

The amount of money remaining in a scholarship fund is reduced by one-fourth every year. The amount of money in the fund is represented by d and the number of years by y. If the fund starts with $10,000, which equation below represents this situation after y years?

A) d = (1/4)(10,000)^y
B) d = (3/4)(10,000)^y
C) d = 10,000(1/4)^y
D) d = 10,000(3/4)^y