Use the Value of the Trigonometric Function to Find $\cos~ t$

Multiple Choice

Use the value of the trigonometric function to find $\cos~ t$ .​ $\cos ( - t ) = - \frac { 1 } { 4 }$ ​

A) $\cos t = \frac { 1 } { 4 }$
B) $\cos t = - 4$
C) $\cos t = \infty$
D) $\cos t = 4$
E) $\cos t = - \frac { 1 } { 4 }$