In Most Caribou (Rangifer Tarandus), Both Males and Females Have

In most caribou (Rangifer tarandus) , both males and females have antlers. What might you hypothesize about antlers in caribou?

A) There is no metabolic cost to caribou to grow antlers.
B) Antlers play no role in caribou since they are found in both species.
C) Both males and females may be involved in dominance hierarchies.
D) Caribou retain their antlers throughout their life span.