John Has the Impression That His Colleague Mark Is Against

John has the impression that his colleague Mark is against his interests and may prevent their boss from considering his request for a promotion. Mark believes that John always spreads false rumors about him and may have played a role in the boss's decision not to increase his annual bonus. John and Mark are probably in:

A) Harmony.
B) Camaraderie.
C) Conflict.
D) Mutual understanding.