Find an Equation for the Ellipse Described $( 0,0 )$ ; Focus At

Multiple Choice

Find an equation for the ellipse described.
-Center at $( 0,0 )$ ; focus at $( - 3,0 )$ ; vertex at $( 4,0 )$

A) $\frac { x ^ { 2 } } { 7 } + \frac { y ^ { 2 } } { 16 } = 1$
B) $\frac { x ^ { 2 } } { 16 } + \frac { y ^ { 2 } } { 7 } = 1$
C) $\frac { x ^ { 2 } } { 9 } + \frac { y ^ { 2 } } { 16 } = 1$
D) $\frac { x ^ { 2 } } { 16 } + \frac { y ^ { 2 } } { 48 } = 1$