The plantation workers were on a collision course before the labor officer intervened.

Answer: Option C

collision : a conflict between opposing ideas, interests, or factions.
retaliatory : (of an action) characterized by a desire for revenge.
perfunctory : (of an action) carried out without real interest, feeling, or effort.
conciliatory : intended or likely to placate or pacify.
circuitous : (of a route or journey) longer than the most direct way.


Antonym of collision is conciliatory