答案：C

先行词是children，从句中parents前缺少定语，故用whose引导定语从句。句意：父母在汶川地震中丧生的100多个孩子已经被好心的夫妇收养和照顾。如果题干改为：Over a hundred children of ______ the parents were killed in the Wenchuan earthquake have been adopted and taken good care of by kind­hearted couples，那么空格处只能填whom。