_____ is a speaker's believability

Generally speaking, the more cohesive a group, the more productive they will be

Indicate whether the statement is true or false

Amanda wants to start eating more organic foods to help prevent any negative health impacts from ingesting pesticides, but she is concerned that she will not be able to afford the organic products. Amanda is lacking:

a. perceived threat severity b. perceived threat vulnerability c. perceived response efficacy d. perceived self-efficacy