Empirical research on the relationship between goal-setting and intrinsic motivation suggests that is(are) the key variable that determines whether short-term or long-term goals increase intrinsic motivation.

the performer's initial level of interest towards the activity

Explanation: Empirical research on the relationship between goal-setting and intrinsic motivation suggests that the performer's initial level of interest towards the activity is(are) the key variable that determines whether short-term or long-term goals increase intrinsic motivation.

Interest always determine motivation towards any goal.

answer; ewing's sarcoma;

answer; did not understand that the act was wrong because she/he was suffering from a mental illness;