Formal, because you would have to cite your sources correctly, use standard punctuation, use standard spelling, avoid contractions, have a thesis statement, and (usually)write in the third person.
The sort of search you need to conduct is official research investigation and direct sources of information like federal statistics and non-goverment organizations groups data.
The keywords that might help in the search would be "mental health issues and homeless", "homeless addictions", and "substance disorders and homeless".
Some research has found that is a direct connection between homelesness and substance use disorders.
It is not responsible to call homeless drug addicts, because beyond what you see there could be a life of pain and suffering.
Research states that homelessness is not a permanent condition but a temporary circumstance that should not define poeple's future.
But sometimes, the information that stems from the research indicates that there is a correlation between substance abuse and people becoming homeless.
This is True.
Interpretation mostly deals with understanding what certain symbols mean and deals with uncovering hidden meanings, while analysis encompasses everything.
The answer is (D). "You have never been as scared as you are now."