答案为A;whose .
whose name实际就是： the name of the small island.
all of us have forgottn whose name(=the name of the small island)
希望对你有所帮助.为什么不选C？记住：whose +n. =the +n.+of which/whom= of which/whom +the +n.如果选C的话，应该在name 前加上the。即：of which the name明白了吗？