—Helen, who fix up the computer in our class?
—I think Jeff can.
A:should
B:would
C:must
D:can
如图,扇形DOE的半径为3,边长为3的菱形OABC的顶点A,C,B分别在OD,OE,弧ED上,若把扇形DOE围成一个圆锥,则此圆锥的高为( )