If a station officer notices that a passenger with a child whose height is more than 1.2 meters wants to pass the ticket gate together, what should he or she do?
选项：

A:He or she should stop the passenger and advise him to buy a ticket for the child more than 1.2 meters tall.;
B:He or she should explain the subway rules to the passenger that a child more than 1.2 meters tall is not free to take the subway.;
C:He or she should advise the passenger to measure the height of the child if he argues that his child is less than 1.2 meters tall.;
D:He or she could call for some help if the passenger refuses to pay for the child’s ticket and insists to take the subway.