Solve the Problem $y = \ln ( \csc x ) , \pi / 6 \leq x \leq \pi / 2$

Multiple Choice

Solve the problem.
-Find the length of the curve $y = \ln ( \csc x ) , \pi / 6 \leq x \leq \pi / 2$

A) $\ln ( \sqrt { 3 } + 2 )$
B) $\ln ( \sqrt { 3 } + 1 )$
C) $\ln ( \sqrt { 3 } )$
D) $1 - \ln ( \sqrt { 3 } + 2 )$