Answer:
C). Optimism bias
Step-by-step explanation:
Optimism bias is described as the type of cognitive bias in which develops a prejudice that a negative or cynical event is less probably to be confronted by them. They have a biased optimism that nothing bad would happen to them which is not necessarily true. In the given example, Mary has this optimism-bias that she would not be diagnosed with flu and therefore, she does not find it important to get a flu shot.