单项选择题
A.movies < -data.frame(c(“Toy Story”,1995),c(“Akira”,1998),c(“The Artist”,2011))
B.movies < -data.frame(“Toy Story”,1995,“Akira”,1998,“The Artist”,2011,column_names =“name”,”year”)
C.movies < -data.frame(“Toy Story”,“Akira”,“The Artist”,1995,1998,2011,col1=“name”,col2=“year”)
D.movies < -data.frame(“name”=c(“Toy Story”,“Akira”,“The Artist”),“year”=c(1995,1998,2011))