Translate the Verbal Model into a Mathematical Model $c = 10 u - 23$

Translate the verbal model into a mathematical model. The cost c each semester is the sum of $10 times the number of units u taken and a student services fee of $23.

A) $c = 10 u - 23$
B) $c = 10 u + 23$
C) $u = 23 c - 10$
D) $c = 23 u - 10$
E) $u = 23 c + 10$