A multiple choice test consists of 4 questions, and each question has 5 answer choices. In how many ways can the test be completed if every question is unanswered? Answers:	A) 24	B) 120	C) 625	D) 720	E) 1024

Rationale: "5 choices for each of the 4 questions , thus total of 5 * 5 * 5 * 5 = 5 ^ 4 = 625 ways . answer : c ."
Answer: C