In festinger and carlsmith's (1959) insufficient justification study, some participants were given $1 to lie about a boring task, whereas others were given $20 to lie about the task. which group ended up deciding that the task was actually interesting?
a. the $1 group, because they had low external justification.
b. the $20 group, because they had low external justification.
c. both groups ended up thinking the task was interesting.
d. neither group ended up thinking the task was interesting.