Using a Sum or Difference Identity, Write the Following as an Expression

Multiple Choice

Using a sum or difference identity, write the following as an expression involving functions of x.
- $\sin ^ { 2 } x \left( \cot ^ { 2 } x + 1 \right)$

A) $- 1$
B) 1
C) $\cos ^ { 2 } x + 1$
D) $\tan ^ { 2 } x$