At What Point(s)in the Interval $[ 0,2 \pi ]$ , Does the Curve Given By

Multiple Choice

At what point(s) in the interval $[ 0,2 \pi ]$ , does the curve given by $y = 7 \ln ( \sin x )$ have horizontal tangents? Round to two decimal places.

A) 0.83, 0.17
B) 1.57, 4.71
C) 0, 3.14
D) There are no horizontal tangents.