Three people each contributed x dollars toward the purchase of a car. They then bought the car for y dollars, an amount less than the total number of dollars contributed. If the excess amount is to be refunded to the three people in equal amounts, each person should receive a refund of how many dollars?

~$\frac{3x-y}{3}$~

~$\frac{x-y}{3}$~

~$\frac{x-3y}{3}$~

~$\frac{y-3x}{3}$~

~$3(x - y)$~