In America, how many people are homeless parents

A．Robert Hayes thought more homeless people are family members.
B．There is a trend that more and more homeless people live in families.
C．The proportion of homeless families remains the same in the country.
D．Most of the children had the opportunity, to study in Boston.

A．one of the serious social problems
B．the present situation of the homeless
C．the make-up of the homeless
D．the life of the homeless