Why are females more likely to care for young than males in a non-sex role reversed species?

A) Male paternity is less certain than female paternity, and males gain more by mating with multiple partners.
B) Female reproductive success depends on maximizing both the number of mates and the number of offspring produced.
C) Females enhance their fitness more by investing in current offspring, while males enhance their fitness more by investing in future offspring.
D) Reproductive competition is highest in females, leading to stronger sexual selection for greater investment in parental care.