Trapezoid A B C D has bases \overline{A B} and \overline{C D} and diagonals intersecting at K. Suppose that A B=9, D C=12, and the area of \triangle A K D is 24. What is the area of trapezoid A B C D ?
Answer Choices
A. 92
B. 94
C. 96
D. 98
E. 100