Because she believes that boys are naughtier than girls, Mrs. Zumpano, a second-grade teacher, watches boys more closely than she watches girls for any signs of misbehavior. Mrs. Zumpano's surveillance strategy best illustrates

confirmation bias                

Explanation:

Confirmation bias: In psychology, the term "confirmation bias" is also denoted as "confirmatory bias", and is determined as an individual propensity to search or grasp information in a specific way that generally confirms or satisfy his or her perception and often creates the statistical error.

A person who experiences confirmation tends to analyze a particular situation the way he or she wants to see it while ignoring other possibilities.

In the question above, Mrs Zumpano's surveillance strategy best illustrates the confirmation bias.