AHSME 1996 Problem 5

Given that $0 < a < b < c < d$, which of the following is the largest? $\text{(A)}\ \frac{a+b}{c+d} \text{(B)}\ \frac{a+d}{b+c} \text{(C)}\ \frac{b+c}{a+d} \text{(D)}\ \frac{b+d}{a+c} \text{(E)}\ \frac{c+d}{a+b}$