2003 AMC 12B Problem 1

Which of the following is the same as

\frac{2-4+6-8+10-12+14}{3-6+9-12+15-18+21}?

\text {(A) } -1 \qquad \text {(B) } -\frac{2}{3} \qquad \text {(C) } \frac{2}{3} \qquad \text {(D) } 1 \qquad \text {(E) } \frac{14}{3}

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.