Al Regularly Pays the Full Amount of Taxes Due, Even

Al regularly pays the full amount of taxes due, even though he could easily hide some of his income and reduce his tax burden, with no risk of getting caught. According to behavioral economics,

A) Al is not economically rational in his behavior.
B) fairness and other moral considerations cause Al to act contrary to his pure self-interest.
C) Al is more ethical than the majority of the population.
D) heuristics are causing Al to act honorably, not a conscious or deliberative thought process.