A student is running a 10-kilometer race. He runs 1 kilometer every 4 minutes. Select the function that describes his distance from the finish line after x minutes.
(1 point)

Select one:
a. f(x) = 1 over 4x + 4
b. f(x) = −1 over 10x + 4
c. f(x) = 1 over 10x + 10
d. f(x) = −1 over 4x + 10