单项选择题

阅读下面程序
import java.io.*;
public class TypeTransition
 public static void main(String args[])
  char a='h':
  int i=100;
  int j=97;
  int aa=a+i:
  System.out.println("aa="+a

A.;
  char bb=(char)j;
  System.out.println("bb="+b
B.;