Without Using a Calculator, Give the Exact Trigonometric Function Value $\sin 30 ^ { \circ }$

Multiple Choice

Without using a calculator, give the exact trigonometric function value with rational denominator.
- $\sin 30 ^ { \circ }$

A) $\sqrt { 3 }$
B) $\frac { \sqrt { 2 } } { 2 }$
C) $\frac { 1 } { 2 }$
D) $\frac { \sqrt { 3 } } { 2 }$