If $C$ is the centre of the ellipse $9x^2 + 16y^2$ = $144$ and $S$ is one focus. The ratio of $CS$ to major axis, is
If $C$ is the centre of the ellipse $9x^2 + 16y^2$ = $144$ and $S$ is one focus. The ratio of $CS$ to major axis, is
- A
$\sqrt 7 :16$
- B
$\sqrt 7 :4$
- C
$\sqrt 5 :\sqrt 7 $
- D
$\sqrt 7 :8$
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