Which equation could be used to solve for the measure of angle p?

circle n is shown with a quadrilateral opqr inscribed inside it. angle o is labeled x degrees. angle p is labeled y degrees. angle q is labeled z degrees. angle r is labeled w degrees.

a. y+x=180
b. y + w = 180
c. y − (z + w) = 360
d. y + z + w = 360