Use the Fundamental Identities to Simplify the Expression $\cot \theta \sec \theta \sin \theta$

Multiple Choice

Use the fundamental identities to simplify the expression.
- $\cot \theta \sec \theta \sin \theta$

A) $\csc ^ { 2 } \theta$
B) $\sec ^ { 2 } \theta$
C) 1
D) $\tan ^ { 2 } \theta$