【名词&注释】
公安机关(public security organs)、开展活动(develop activities)、副省级城市(vice-provincial city)、国内旅游、中国公民(chinese citizen)、履行合同(perform a contract)、边防检查站、被代理人(principal)、有关规定(related regulations)、承担责任(undertake responsibility)
[单选题]因未达到约定人数不能出团的,组团社经征得旅游者书面同意,可以委托其他旅行社履行合同。组团社、旅游者、受委托的旅行社之间存在什么关系()。
A. 受委托的旅行社对旅游者承担责任(undertake responsibility);组团社对受委托的旅行社承担责任(undertake responsibility)
B. 组团社对受委托的旅行社承担责任(undertake responsibility);受委托的旅行社对旅游者承担责任(undertake responsibility)
C. 组团社对旅游者承担责任(undertake responsibility);受委托的旅行社对组团社承担责任(undertake responsibility)
D. 旅游者对受委托的旅行社承担责任(undertake responsibility);组团社对旅游者承担责任(undertake responsibility)