GAUSS7 2002 Problem 3

Past Contests GAUSS7 GAUSS (GR. 7) - 2002
, ,
1

\displaystyle\frac{2+1}{7+6} equals

Answer Choices
A. \frac{3}{13}
B. \frac{21}{76}
C. \frac{1}{21}
D. \frac{2}{13}
E. \frac{1}{14}