b) From the literature I looked at, and the very wikipedia article I linked, it is true for homeless youth as a whole.

E.g. the very first sentence in the abstract:

> A disproportionate number of lesbian, gay, bisexual and transgender (LGBT) youth experience homelessness each year in the United States.

in

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4098056/