What does B.O.S.G. stand for in rabbit show terminology?

In rabbit show terminology, B.O.S.G. stands for Best Opposite Sex of Group. This term is used to recognize the rabbit that is deemed the best among the opposite sex competitors in a specific category or group. For example, if there is a "Best in Group" award that highlights the top rabbit overall, the B.O.S.G. designation highlights the best rabbit from the opposite sex that competed in that same group. This distinction is important in shows as it acknowledges the quality and standards of both male and female rabbits within their classifications, offering a comprehensive recognition of merit in the competition.

Other options do not accurately represent the terminology used in rabbit shows. For instance, while "Best Of Show Group" might suggest a category for overall group winners, it is not the correct designation for the opposite sex award. Similarly, "Best Of Show Guinea" is specific to guinea pigs and does not pertain to rabbits, and "Best Of Standard Group" does not reflect the terminology recognized within rabbit show circles. Thus, B.O.S.G. as Best Opposite Sex of Group is the accurate choice within the context of the question.