Find an Equation in Standard Form for the Ellipse That $\frac { x ^ { 2 } } { 25 } + \frac { y ^ { 2 } } { 81 } = 1$

Multiple Choice

Find an equation in standard form for the ellipse that satisfies the given conditions.
-The horizontal major axis is of length 18 , and the minor axis is of length 10 .

A) $\frac { x ^ { 2 } } { 25 } + \frac { y ^ { 2 } } { 81 } = 1$
B) $\frac { x ^ { 2 } } { 9 } + \frac { y ^ { 2 } } { 5 } = 1$
C) $\frac { x ^ { 2 } } { 81 } + \frac { y ^ { 2 } } { 25 } = 1$
D) $\frac { x ^ { 2 } } { 5 } + \frac { y ^ { 2 } } { 9 } = 1$