6th grade ela help me pleasee :))

You have been given an assignment to speak on the federal prison system in the u.s. which of the following sources is likely to be the least credible? a. an interview with an inmate of a federal prison b. the us department of justice “federal bureau of prisons” website: c. the website [] which discusses the danger of releasing an alarming number of convicts back into society d. an article from foxnews.com about the florida state penitentiary

It's to know your purpose before you read something because a purpose can:

Can someone me answer this english question