the glass house mountains in Queensland, Australia, were sighted in 1770 by the English navigator captain James Cook, by whom they were named supposedly because its sheer wet rocks glistened like glass. B. by whom they were named supposedly and their (换成because的话是不是可以选这个选项了? 跟D对比哪个更好) C. naming them supposedly since their (此选项since用做表原因的话差距在哪里?) D. who so named them supposedly because their (正选答案)