Answer:
A. situations in which people make choices that do not appear to be economically rational.
Explanation:
Behavioral Economics studies how the effect of emotional, psychological, cognitive, social and cultural factors relate to the economic decision making processes of institutions and individuals. It aims to understand why we make irrational decisions.
Considering this infromation we can conclude that the correct answer is A. situations in which people make choices that do not appear to be economically rational.
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