Compared to the Monopoly Outcome with a Single Price, Imperfect

Multiple Choice

Compared to the monopoly outcome with a single price, imperfect price discrimination can do which of the following?
(i) raise welfare
(ii) lower welfare
(iii) leave welfare unchanged

A) (i) and (ii)
B) (ii) and (iii)
C) (i) and (iii)
D) (i) , (ii) and (iii)