Ajzen (1985) decided to extend the theory of reasoned action by introducing which of the following variables?

A) subjective norms
B) behavioral control
C) behavioral intention
D) attitude

Ajzen (1985) introduced the variable of behavioral control in the extended theory of reasoned action. It refers to the perceived level of ease or difficulty of performing a behavior and how much control the individual has over its performance. This variable is important because even if individuals have a positive attitude and intention to perform a behavior, they may not be able to do so if they face obstacles or barriers in the environment. Therefore, adding behavioral control to the theory helps to account for the influence of external factors on behavior. The other variables (subjective norms, behavioral intention, and attitude) were already part of the original theory of reasoned action.