In the diagram shown, David begins at A and walks in a straight line to C, and then walks in a straight line from C to B. Cindy also begins at A and walks in a straight line to B. How much farther does David walk than Cindy?
Answer Choices
A. 0\:m
B. 2\:m
C. 4\:m
D. 6\:m
E. 7\:m