单项选择题
A.＜include ＜stdio.h＞int main（）{int a =1；int b =2；printf（"%d %d\n"，a，b）；return 0；}
B.＜include ＜stdio.h＞int main（）{int a =1；int b =2；printf（"%d，"a）；printf（"%d\n"，b）；return 0；}
C.＜include ＜stdio.h＞int main（）{int a =1，b =2；printf（"%d，，%d\n"，a，b）；return 0；}
D.＜include ＜stdio.h＞int main（）{int a =1，a=b =2；printf（"%d，%d\n"，a，b）；return 0；}