Which of the Following Is Not One of the Assumptions

Which of the following is not one of the assumptions behind Rosenstock's health-belief model? People's decisions about health-related behaviors are guided by

A) a perception of the seriousness of a specific illness.
B) statistics outlining the probability of contracting a specific illness.
C) the belief that a particular behavior will reduce the threat of a specific illness.
D) a perception of a personal threat of contracting a specific illness.