The heuristic-systematic model of persuasion suggests that we engage in
a. less effortful processing when our attitudes and behaviors do not agree with each other
b. less effortful processing when we lack ability or capacity for more careful processing
c. more effortful processing when our attitudes and behaviors do not agree with each other
d. less effortful processing when we have relatively more knowledge about the message's topic

The correct option to fill the blank will be option "C"

Explanation:

According to the Heuristic-Systematic model of persuasion, if we know more about a certain topic we will put less effort in our cognitive functions, but in the case that our attitudes and behaviors don't agree with each other we will put more load into our cognitive functions and develop a stable behavior and resistant against counter opinions.

answer; the candidate for vice president;

answer; longitudinal;