Which Test Could Best Be Used to Test the Hypothesis

Multiple Choice

Which test could best be used to test the hypothesis that the performance of employees depends on the reward they receive,because this reward increases their motivation (all variables are measured on a 5-point Likert scale) ?

A) Multiple regression with an interaction effect.
B) Multiple regression with dummy variables.
C) Three multiple regression models so that mediation can be tested.
D) Simple regression.