下图所示C++代码对大写字母'A'到'Z'分组，对每个字母输出所属的组号，那么输入'C'时将输出的组
号是？( )。
char c;while(1){ cin >> c; if(c=='q') break; switch(c){ case 'A': cout << "1 "; break; case 'B': cout << "3 "; case 'C': cout << "3 "; case 'D': cout << "5 "; break; case 'E': cout << "5 "; break; default: cout << "9 "; } cout << endl;}