【单选题】R 中数据框用 data.frame() 生成,如果生成这样一个表格需要怎样的语句( ) Name Age sex John 13 F James 12 M Ming 13 F
A.
> df + Name=c("John","James","Ming"), + Age=c(13,12,13), + sex=c("F","M","F") + );df > df
B.
> df + "John","James","Ming", + 13,12,13, + "F","M","F" + );df > df
C.
> df + “ Name ” , ” Age ” , ” sex ” , + "John","James","Ming", + 13,12,13, + "F","M","F" + );df > df
D.
> df + “ Name ” , ” Age ” , ” sex ” , + "John",13,"F", + "James",12,"M", + "Ming",13,"F" + );df > df