At one point, why is Chris forced to stay in a bathroom at a train station with his son?

A、Hedoesn’twantotherpeopletofindthem.;
B、Hedoesn’thavemoneytopayfortherent.;
C、Hewantstoplayjokewithhisson.;
D、Hefindsoutthatthebathroomisacomfortableplace.