Correct Answer:
B. An affidavit and available evidence
The correct answer is An affidavit and available evidence. For a complainant, other than a Department or Whistle-blower, to initiate a public nuisance complaint, formal documentation is crucial. An affidavit provides a sworn statement of facts, lending legal weight to the complaint, and available evidence substantiates the claims made. Options like a legal fee (A), a witness list (C), or a medical certificate (D) are generally not initial requirements for filing the complaint itself, though they might become relevant during subsequent legal proceedings or specific types of nuisance cases.