Use the Appropriate Reciprocal Identity to Find the Function Value $\cos \theta$

Multiple Choice

Use the appropriate reciprocal identity to find the function value. Rationalize the denominator if necessary.
- $\cos \theta$ , if $\sec \theta = - 9.5$

A) $\frac { 2 } { 19 }$
B) $- \frac { 19 } { 2 }$
C) $\frac { 17 } { 19 }$
D) $- \frac { 2 } { 19 }$