describe three components of attitude
Different authors have offered different definitions of "attitude," although most of them concur that it is the positive or negative way in which an individual evaluates everything and everybody that constitutes her environment.
Drawing on the ABC model, the three components you are looking for are affect, behavior, and cognition. Hence the name of the model.
Affect refers to the emotions that people or things arouse in others. In this context, the term must be understood as neutral, for the emotions may be colored by either positive or negative perceptions of the object. Affect, therefore, is dependent on subjectivity and/or previous experiences and/or expectations.
Behavior is the way in which an individual expresses her reactions. The world around us necessarily triggers a response, which is expressed by means of verbal language, body language, or both.
Cognition is an internal process through which an individual, comparing and contrasting the reality before her to knowledge or experience previously internalized, will make a judgment on the object.