If a Manufacturing Process Takes 3 Hours Per Unit of X

If a manufacturing process takes 3 hours per unit of x and 5 hours per unit of y and a maximum of 100 hours of manufacturing process time are available,then an algebraic formulation of this constraint is:

A)
$3 x + 5 y \geq 100$
B)
$3 x - 5 y \leq 100$
C)
$3 x + 5 y \leq 100$
D)
$3 x - 5 y \geq 100$