Cynthia Has Developed an Informal Hypothesis: "If a Student Is

Cynthia has developed an informal hypothesis: "If a student is a psychology major, then that student favors gun control." She questions 20 psychology majors and all 20 do favor gun control. However, she does not pursue additional information. Specifically, she does not seek out people who oppose gun control to determine whether they are psychology majors. From the perspective of deductive reasoning, Cynthia has

A) demonstrated confirmation bias.
B) relied too heavily on the belief-bias effect.
C) relied too heavily on counterexamples.
D) overused the availability heuristic.