When a Monopolist Engages in Perfect Price Discrimination,the Quantity Produced

When a monopolist engages in perfect price discrimination,the quantity produced and sold

A) is lower than the quantity produced and sold if it adopted a single price.
B) is higher than the quantity produced and sold if it adopted a single price.
C) is the same level as that produced and sold if it adopted a single price.
D) could be lower, higher or the same as that produced and sold if it adopted a single price.