Taken as a Whole,the Results from Studies Investigating Mental Illness

Taken as a whole,the results from studies investigating mental illness among the homeless indicate that,compared to the non-homeless,homeless persons are

A) less likely to suffer from mental health problems or substance abuse problems.
B) equally likely to suffer from mental health problems.
C) more likely to suffer from mental health problems.
D) less likely to suffer from mental health problems, but more likely to exhibit substance abuse problems.