Question

Quadrilateral ABCD is inscribed in circle P as shown. Which statement is necessarily true?

A.
m∠A + m∠B = m∠C + m∠D

B.
m∠A + m∠C = m∠B + m∠D

C.
m∠A + m∠D = m∠B + m∠C

D.
m∠A + m∠B = 2(m∠C + m∠D)