问题

Air Asia aircraft of Indonesia, with 162 people on _____board, is reported to have crashed into the sea.
A:An; a
B:The; a
C:An; 不填 D.不填; 不填;
D:不填; 不填;
B:The; a
C:An; 不填 D.不填; 不填;
D:不填; 不填;
正确答案是: