Find a Rectangular Equation for the Plane Curve Defined by the Parametric

Multiple Choice

Find a rectangular equation for the plane curve defined by the parametric equations.
- $x = \sin t , y = 3 \cos t$

A) $x ^ { 2 } + 9 y ^ { 2 } = 9$
B) $9 x ^ { 2 } + y ^ { 2 } = 1$
C) $x ^ { 2 } + 9 y ^ { 2 } = 1$
D) $9 x ^ { 2 } + y ^ { 2 } = 9$