Which Is a Distortion (A Loss of Social Surplus)associated with a Monopolist's

Multiple Choice

Which is a distortion (a loss of social surplus) associated with a monopolist's inability to observe consumer types when constructing a nonlinear pricing scheme?

A) the monopolist must expend more resources on market research.
B) all bundles involve inefficiently low quantities.
C) only some bundles involve inefficiently low quantities.
D) quantities aren't distorted, but prices extract too much consumer surplus.