In the US, AT&T Has Made a Practice of Offering Residential Customers

In the U.S., AT&T has made a practice of offering residential customers a one low- rate long distance telephone service, but only to those that ask for it or to those that have switched or threaten to switch long- distance carriers. Under the Canadian Competition Act this would be called

A) predatory pricing.
B) resale price maintenance.
C) discriminatory pricing.
D) regional price discrimination.
E) none of the above