单项选择题

A.IF(G2=博士,300,IF(G2=研究生,300,IF(G2=本科生,200)))
B.IF(G2="博士",300,IF(G2="研究生",300,IF(G2="本科生",200)))
C.IFERROR(IF(G2=博士,300,IF(G2=研究生,300,IF(G2=本科生,200))),100)
D.IFERROR(IF(G2="博士",300,IF(G2="研究生",300,IF(G2="本科生",200))),100,50)