【单选题】

请分析下列程序。

int main(){printf("This is in main program");if(fork()==0)printf("I am in child process");elseprintf("I am in parent process");}
程序正确运行后结果是
A. This is in main program I am in child process I am in parent process
B. This is in main program I am in child process
C. This is in main program I am in parent process
D. This is in main program I am in child process This is in main program I am