Use the Trigonometric Substitution to Select the Algebraic Expression as a Trigonometric

Multiple Choice

Use the trigonometric substitution to select the algebraic expression as a trigonometric function of $\text { } \theta \text {, where } 0 < \theta < \frac { \pi } { 2 } \text {. }$ $\sqrt { 25 x ^ { 2 } + 36 } , 5 x = 6 \tan \theta$

A) $5 \tan \theta$
B) $25 \sec \theta$
C) $25 \tan \theta$
D) $- 5 \sec \theta$
E) $6 \sec \theta$