Find Area of Figure $21 \mathrm{yd}$ , Long Base Of $30 \mathrm{yd}$

Multiple Choice

Find area of figure. Round to the nearest hundredth if necessary.
-Of a trapezoid with short base of $21 \mathrm{yd}$ , long base of $30 \mathrm{yd}$ , and height of $11 \mathrm{yd}$

A) $315 \mathrm{yd}^{2}$
B) $280.5 \mathrm{yd}^{2}$
C) $165 \mathrm{yd}^{2}$
D) $561 \mathrm{yd}^{2}$