They offer sympathy when someone experiences difficulties or is subjected to discipline, are quick to lighten a serious moment with humor, and try to resolve issues that threaten to divide the group.
句意：当有人经历困难或受到纪律约束时，他们会给予同情，并迅速地用幽默来化解过于严肃的时刻，并试图解决那些威胁要分裂这个群体的问题。resolve解决。与 find a solution for意思最相近。因此，本题的正确答案为D。