What amount of fence per side?

Beth is going to enclose a rectangular area in back of her house. The house wall will form one of the four sides of the fenced in area, so Beth will only need to construct three sides of fencing. Beth has 48 feet of fencing. She wants to enclose the maximum possible area. What amount of fence should Beth use for the side labeled x?
A. 16 feet
B. 12 feet
C. 32 feet
D. 24 feet

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