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

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

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