When pitch, stress and sound length are tied to the sentence rather than the word in isolation, they are collectively known as

A．syntax.
B．register.
C．morphology.
D．phonology.

A．exhibiting a sensitiveness to the symbolic implications of experience, such as love, death, immortality etc.
B．having the poetic conventions similar to Walt Whitman's.
C．punishing social evils.
D．showing the direction for future free verse poets.