单选题

执行下列语句序列 struct AA{ int ival; char cval;}; struct BB{ int ival; AA ra;}; struct CC{ int ival; AA ra; BB rb;}; CC rc={66,{rc.ival+1,rc.ra.ival+1},{69,{70,71}}}; cout<<rc.ival<<','<<rc.ra.ival<<','<<rc.rb.ra.ival; 后，显示在屏幕上的是[ ]。

Question

A. 66,67,68

B. 67,68,69

C. 66,67,70

D. 67,69,70