Listen, John! I can hear someone _____ in the next room. [ ]

A. talk

B. talking

C. to talk

D. talks

某旅行社组织50人的旅游团到华山旅游，在游览期间，游客刘某向导游人员提出自行游览，随后离团自行上山，结果不慎跌伤手臂。对此该旅行社不承担赔偿责任。