Find the Area of the Figure Below $n a+\frac{1}{2}(\mathrm{nc})$

Multiple Choice

Find the area of the figure below. (Angles that look like right angles are right angles) .

A) $n a+\frac{1}{2}(\mathrm{nc})$ square units
B) $n (c-a) +\frac{1}{2}(\mathrm{nc})$ square units
C) $n (c+a) +\frac{1}{2}(\mathrm{nc})$ square units
D) $n (a-c) +\frac{1}{2}(\mathrm{nc})$ square units
E) None of the answers is correct.