Why do journalists need to verify the facts that their sources share with them?

A. Journalists are held to a high bar, epistemologically, which means that their claims need to be verified and checked by others.
B. Journalists publish non-fiction, which means that the facts that they include must line up with reality.
C. Journalists are responsible for publishing knowledge that reflects our shared world of facts, data, and evidence (not their own creative imaginations).
D. Journalists actually don't need to verify facts; it's enough to find one whistleblower to disclose the truth about a company or a situation.
E. If you can locate a person who tells you their personal experience with something, this is sufficient for journalists.