genetic makeup of corn
Source : Verbat Set 21
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While studying the genetic makeup of corn, a new class of mutant genes was discovered by Barbara McClintock, a discovery which led to greater understanding of cell differentiation.
A. a new class of mutant genes was discovered by Barbara McClintock, a discovery which led
B. a new class of mutant genes in corn were discovered by Barbara McClintock, leading
C. Barbara McClintock discovered a new class of mutant genes, and it led
D. Barbara McClintock discovered a new class of mutant genes, a discovery that led
E. Barbara McClintock, who discovered a new class of mutant genes, leading


OA D
What is wrong with C ??

As "IT" cannot refer to Barbara Mc.
IT" may refer to DISCOVERED ...right ??
Is it beacuse "IT" does not have a good referent such as DISCOVERY, we kill option C ?

Any1 Any thought(s)