Stephen is making a rectangular garden. He has purchased 84 feet of fencing. What length (l ) and width (w) will maximize the area of a garden with a perimeter of 84 feet?


A l = 21 feet

w = 21 feet

B l = 32 feet

w = 10 feet

C l = 42 feet

w = 42 feet

D l = 64 feet

w = 20 feet