Answer:
Availability heuristic
Step-by-step explanation:
Availability heuristic can also be referred to as availability bias. It is a cognitive process of making quick decision or judgment about certain things or situations based on easily perceived examples or scenarios associated with such situation. Availability heuristic derived decisions are often quick but incorrect since it makes use of inference from easily available reference that comes to mind at that particular time.
From the question, Jacob quick response was based on how he perceived Tom at that given instance. This response could be incorrect because jacob had never really thought about how short tempered or calm tom was until he asked. This cognitive process is most likely Availability heuristic