Answer:
The representativeness heuristic.
Step-by-step explanation:
Representativeness heuristic occurs when an individual makes a general assumption about the likelihood of an event through unreliable information. It can be easily described as making judgement of an object and categorizing them wholly just by getting a fragment of information.
Here, after Henry meets a woman who opposes the death penalty, the fact that he assumes that women are more likely to oppose the death penalty than men is a case of representativeness heuristic. Just by observing one woman's opinion, he assumes that all women are likely to oppose the death penalty.