What is the term used for longtime street residents who often suffer from mental illness,drug abuse,or alcoholism?

A) the hidden homeless
B) the economic homeless
C) the chronic homeless
D) the displaced homeless

The term used for longtime street residents who often suffer from mental illness, drug abuse, or alcoholism is "the chronic homeless". Option A ("the hidden homeless") refers to individuals who are homeless but do not necessarily sleep on the streets, while option B ("the economic homeless") refers to those who have lost their homes due to financial reasons. Option D ("the displaced homeless") generally refers to individuals who have been forced out of their homes due to natural disasters, conflicts, or other similar situations.