Solve the Problem $1998 \mathrm { in. } ^ { 2 }$

Solve the problem.
-A rectangular sheet of paper is 57 in. by 39 in. An area in the shape of a parallelogram with a Height of 15 in. and a base of 30 in. is cut from the paper. How much area is left over?

A) 2673 in. ²
B) $1998 \mathrm { in. } ^ { 2 }$
C) 648 in. $^ { 2 }$
D) 1773 in. ²