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

At one point， why is Chris forced to stay in a bathroom at a train station with his son？
A.He finds out that the bathroom is a comfortable place.
B.He doesn’t have money to pay for the rent.
C.He doesn’t want other people to find them.
D.He wants to play joke with his son.
正确答案：He doesn’t have money to pay for the rent.