3. 化合物命名為?(A) 1,3-dimethylbicyclo[1.2.3]hexane(B) 1,3-dimethylbicyclo[1.2.3]hexane(C) 6,8-dimethylbicyclo[1.2.3]octane(D) 6,8-dimethylbicyclo[3.2.1]octane