Refer to the figure.
Primary helpers are less likely to survive and reproduce the following year than secondary helpers. Based on the results shown here, we can predict that secondary helpers are

A) related to the breeders and gain direct benefits through their helping effort.
B) unrelated to the breeders and gain direct benefits through their helping effort.
C) related to the breeders and gain indirect benefits through their helping effort.
D) unrelated to the breeders and gain indirect benefits through their helping effort.