Vinay Has a Board That Is $13 \frac { 1 } { 2 }$

Multiple Choice

Vinay has a board that is $13 \frac { 1 } { 2 }$ feet long. If he cuts off a piece $5 \frac { 3 } { 4 }$ feet long, how long is the remaining piece of board?

A) $7 \frac { 3 } { 4 }$ feet
B) $8 \frac { 3 } { 4 }$ feet
C) $4 \frac { 1 } { 4 }$ feet
D) $7 \frac { 1 } { 4 }$ feet
E) none of these