答案：B
解析：A的形式是错误的,which引导定语从句,一般在从句中作主语或宾语,如果选A,就变成which修饰results了,但是which不能作定语,应该用whose,而B的形式是正确的,用of表示所属关系,就可以了.
A survey was carried out on the death rate of new -born babi
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