("x)( P(x，y)∨Q(z))∧($y) (R(x, y) → ("z) Q(z))中量词“"”的辖域是( )．

单选题 (5 分) 5分
A.
P(x, y)

B.
P(x, y)∨Q(z)

C.
R(x, y)

D.
P(x, y)∧R(x, y)