导游员张某在带团路经某居民小区时，突然从小区的高楼内抛出一只烟灰缸，将游客王某砸伤。关于砸伤王某的责任承担，下列说法正确的是（）。
A.导游员张某违反安全保障义务，应承担侵权责任
B.顶层业主通过证明当日家中无人，可以免责
C.小区物业违反安全保障义务，应承担侵权责任
D.如果查明烟灰缸系从八层抛出，八层以上业主仍应承担补充责任
正确答案：B
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