Final answer:
Differential Association Theory explains how individuals learn to define certain behaviors as deviant based on interaction with others. Edwin Sutherland suggests that deviance is learned from those who model it. Option A.
Step-by-step explanation:
The explanation that focuses on why and how people come to define some acts as deviant, and not others, is found in the theory of differential association.
Edwin Sutherland's Differential Association Theory suggests that deviant behavior is learned through social interaction with others who provide models of and opportunities for deviance.
In this theory, it isn't a personal choice as much as it is a socialization process where individuals are exposed to various definitions of behavior that are deemed favorable or unfavorable by those around them (Sutherland 1960).
The correct answer to the question is, therefore, A. Differential Association Theory.
Other theories mentioned, such as Social Control Theory and the Italian School of Criminal Anthropology, offer different explanations for deviant behavior that do not focus on the social learning aspect of defining deviance.
Hence, the right answer is option A.