What is the term for basing the estimated probability of an event on the ease with which instances come to mind

A)  representativeness heuristic 
B)  law of small numbers 
C)  conjunction fallacy 
D)  availability heuristic

Availability Heuristic

A cognitive shortcut based on the first examples that spring to mind when considering a particular topic, idea, strategy, or choice.

Estimated Probability

A statistical measure expressing the likelihood of a specific event occurring based on current evidence or past occurrences.

Instances

Specific examples or occurrences of a particular event, situation, or phenomenon.