把一根木棒截成三段要用6分钟,照这样计算,如果截成四段要用几分钟。请选择ABCD3w4g3k5Q2p*c8A-x/c-I
A.6-x/c-I
B.8-x/c-I
C.9-x/c-I
D.12-x/c-I