Choose the correct answer:A behavior A is specified by an Activity.

In UML, a specialized behavior that is an extension or modification of a more general behavior is typically shown using the generalization relationship. Option A correctly models this scenario by showing behavior B as a specialization of behavior A, which is indicated by the containment within the package and a nesting of B inside A without any stereotype on the relationship. This representation implies that B inherits the characteristics of A while potentially adding or overriding some aspects of it.

References:

UML 2.5 Specification: Generalization is defined in the UML 2.5 Specification, where a more specific classifier may override the behaviors of a more general classifier.