What is the formula for the area A of a trapezoid with parallel sides of length B and D, nonparallel sides of length A and C and height H?

A. A = 1/2h (a+c)
B. A = 1/2h (b + d)
C. A = a+b + c + d
D. A= abcd
E. A = 1/2h (a+b+c+d)