Without Using a Calculator, Give the Exact Trigonometric Function Value $\mathrm { x }$

Multiple Choice

Without using a calculator, give the exact trigonometric function value with rational denominator.
-Find the exact value of $\mathrm { x }$ in the figure.

A) $4 \sqrt { 3 }$
B) $4 \sqrt { 5 }$
C) $4 \sqrt { 6 }$
D) $4 \sqrt { 2 }$