The availability heuristic functions on which principle?

A) Things that are more easily remembered are assumed to occur more often.
B) Things that we understand now always would have happened.
C) If we are certain,we must be right.
D) The best evidence affirms our hypothesis.

The availability heuristic is a mental shortcut that relies on immediate examples that come to a person's mind when evaluating a specific topic, concept, method, or decision. The principle is that if something can be recalled, it must be important, or at least more important than alternative solutions which are not as readily recalled. Hence, things that are more easily remembered are assumed to occur more often.