The eccentricity of ellipse $\frac{x^2}{16} + \frac{y^2}{9}=1$ is:

Question

( A ) $\frac{\sqrt{7}}{4}$
( B ) $\frac{\sqrt{7}}{2}$
( C ) $\frac{5}{4}$
( D ) $\frac{7}{16}$