Please someone help me!! it would be very much appreciated :) <3

Steve purchased a set of golf clubs for his son from Super Golf. The sale price of the set of golf clubs is represented by the expression below.
x - 0.6x

Which statement best describes 0.6x?
A.
It is the amount of the discount.

B.
It is the price per golf club in the set.

C.
It is the amount of the tax.

D.
It is the cost of the set of golf clubs.