Jack ate $\large\frac{1}{16}$ of a pizza and his friend Jill ate $\large\frac{9}{16}$ of the pizza. How much total pizza did they eat altogether?

Question

( A ) $\large\frac{2}{5}$
( B ) $\large\frac{8}{5}$
( C ) $\large\frac{5}{8}$
( D ) $\large\frac{5}{8}$