An Arch Is a Semi-Ellipse 16 Meters Wide and 8 $\quad \frac { x ^ { 2 } } { 64 } + \frac { y ^ { 2 } } { 64 } = 1$

An arch is a semi-ellipse 16 meters wide and 8 meters high.Write the equation of the ellipse if the ellipse is centered at the origin.

A) $\quad \frac { x ^ { 2 } } { 64 } + \frac { y ^ { 2 } } { 64 } = 1$
B) $\frac { x ^ { 2 } } { 8 } + \frac { y ^ { 2 } } { 16 } = 1$
C) $\frac { x ^ { 2 } } { 64 } - \frac { y ^ { 2 } } { 64 } = 1$
D) $\frac { x ^ { 2 } } { 64 } + \frac { y ^ { 2 } } { 8 } = 1$
E) none of these