Tim receives 30 benefits for every 15 contributions he makes to his relationship with Sarah. Sarah, on the other hand, receives 25 benefits for every 5 contributions she makes. According to equity theory, ______.

A. Tim is over-benefitted and Sarah is underbenefitted
B. Tim is underbenefitted and Sarah is over-benefitted
C. both Tim and Sarah are underbenefitted
D. both Tim and Sarah are over-benefitted

B. Tim is underbenefitted and Sarah is over-benefitted