Complete the Sentence So the Result Is an Identity $1 + \ldots = \csc ^ { 2 } x$

Multiple Choice

Complete the sentence so the result is an identity. Let x be any real number.
- $1 + \ldots = \csc ^ { 2 } x$

A) $\sin ^ { 2 } x$
B) $\cot ^ { 2 } x$
C) $\sec ^ { 2 } x$
D) $\cos ^ { 2 } x$