AMC8 2016 Problem 2

Past Contests AMC8 AMC 8 - 2016
1

In rectangle A B C D, A B=6 and A D=8. Point M is the midpoint of \overline{A D}. What is the area of \triangle A M C ?

Answer Choices
A. 12
B. 15
C. 18
D. 20
E. 24