A Company Charges More Per Bottle When Consumers Buy Bigger

A company charges more per bottle when consumers buy bigger bottles of shampoo.It works on the premise that people who buy small packs of shampoo are price sensitive.Therefore, the company offers them discounts of up to 70 percent.If a customer buys shampoo in bottles, she ends up paying up more per millilitre.This is an example of:

A) price fixing.
B) price discrimination.
C) predatory pricing.
D) referral selling.
E) resale price maintenance.