What Do Complex Research Findings on an Equity Approach to Motivation

What do complex research findings on an equity approach to motivation mean for what international managers should do?

A) Mangers should think through how their own cultural values might affect their use of equity rules in doling out rewards
B) Managers should implement motivational methods with which they are most familiar
C) Managers should take the time needed to understand how their subordinates' cultural values might affect their assessment of equity rules when they are used
D) Both a and c