The Policies Related to the Use of Plastic Bags at IKEA

The policies related to the use of plastic bags at IKEA and in Ireland demonstrate that

A) consumer practices are very difficult to change.
B) well-designed policies can incentivize humans to change their behavior radically and quickly.
C) consumers generally prefer plastic bags over paper bags.
D) the use of plastic bags is a relatively insignificant issue in the most of the world.