Which of the Following Is an Example of Rational Ignorance

Which of the following is an example of rational ignorance?

A) Glenda chooses to purchase a new CD at the store 1 mile from her home instead of driving all over town to see if she can find a lower price.
B) Bob chooses not to vote since his vote will never swing the outcome of an election.
C) ABC Corporation chooses to hire local workers instead of outsourcing jobs to another country.
D) Jane decides not to study for her test tomorrow even though studying could raise her grade significantly.