Solve the Problem $6400 \mathrm { ft } ^ { 2 }$

Multiple Choice

Solve the problem.
-You have 80 feet of fencing to enclose a rectangular region. What is the maximum area?

A) $6400 \mathrm { ft } ^ { 2 }$
B) $400 \mathrm { ft } ^ { 2 }$
C) $1600 \mathrm { ft } ^ { 2 }$
D) $396 \mathrm { ft } ^ { 2 }$