(D) 30 degrees
Step-by-step explanation:
An inscribed angle is an angle formed by two chords in a circle which have a common endpoint.
Theorem(Inscribed Angles Conjecture I): In a circle, the measure of an inscribed angle is half the measure of the central angle with the same intercepted arc.
By the theorem above and from the attached diagram,
Inscribed Angle p =Half of 60 degrees
![\angle p=0.5 X 60^\circ\\p=30^\circ](/tpl/images/0668/7149/85ed6.png)
The correct option is D.
![(Inscribed Angles) What is the value of p? -50 -60 -100 -30](/tpl/images/0668/7149/8dd74.jpg)