If Ube=0.7V, it means that the triode will be turned on, UBE is 0.7V, and the triode has been damaged;

When the triode is on, if UCE = UC-UE >；; 0.7V, triode in amplification area, UCE

So choose a. amplification area;

When VC=VB, it is close to the saturation region, but still in the amplification region.