Final answer:
The term describing temporarily homeless individuals who stay with friends or family is 'Couchsurfing'. It denotes a subsection of homelessness and highlights the complexity of the issue, which includes various underlying causes.
Step-by-step explanation:
The term used to describe people without homes who stay with friends or family temporarily rather than in shelters or in public spaces is C) Couchsurfing. This situation often occurs when individuals lack a permanent residence due to homelessness and rely on the hospitality of others for a place to sleep temporarily. Although these individuals have a temporary place to stay, they still face the broader issue of homelessness, which is a complex problem with various underlying factors such as scarce resources, substance abuse, mental illness, economic instability, and insufficient affordable housing options.