So far all cloned animals have suffered from some different serious disorders, ______ dying soon after birth.
A.many of which
B.many of whom
C.many of them
D.many of that
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C解析考察独立主格结构。独立主格结构不是句子，是短语，但是它的作用相当于句子。many of them dying soon after birth= and many of them are dying soon after birth.本句题干中缺少连词，说明后面不是句子，排除A
B. that指代单数名词，而这里的them指代的all cloned animals，应该使用复数形式。