Final answer:
The phrase 'split asunder' in the context of the question implies being A. divided into separate parts or sides of an issue, indicating disunity and fragmentation that can weaken a group's efficacy.
Step-by-step explanation:
The phrase split asunder suggests being divided into separate parts or sides of an issue. In the context provided, it conveys the idea that a group is fragmented and tends not to be effective due to the lack of unity.
It indicates that there is disunity and a remarkable division that could potentially weaken the ability to face challenges, similar to how divided government can hinder policy goals due to the clash of opposing parties.
The correct option in the final answer, as suggested by this context, is 'A. divided into separate parts or sides of an issue'.