An intervention may be defined as a ______.

A) philosophy
B) research method
C) procedure
D) set of attainable objectives

An intervention refers to a specific procedure or set of actions designed to achieve a particular goal or outcome, typically in the context of addressing a problem or improving a situation. While interventions may be informed by research methods or philosophical perspectives, they are ultimately characterized by their concrete, actionable nature. Therefore, option C, "procedure," is the best choice.