Eusocial Breeding Systems Are an Example Of

Eusocial breeding systems are an example of:

A) systems where individuals who carry traits with zero fitness are sacrificed for the benefit of the system.
B) systems where some individuals of a group carry traits that have extremely high fitness, while other individuals carry traits that have zero fitness but sustain the high fitness of the other members.
C) systems where alleles who carry traits with zero fitness disappear after a few generations.
D) systems where individuals who carry traits with zero fitness are not as important as those who carry traits with high fitness.