Solve the Problem $72 \mathrm { in } ^ { 2 }$

Multiple Choice

Solve the problem.
-How many square inches are in 6 square yards?

A) $72 \mathrm { in } ^ { 2 }$
B) $216 \mathrm { in } ^ { 2 }$
C) 7776 in. $^ { 2 }$
D) $864 \mathrm { in. } ^ { 2 }$