In which of the following situations are you least likely to see free riders? (Hint: Please note how the question is phrased.) O The instructor has announced that every student will receive 5% extra credit if 90% of students turn in course evaluations. O The instructor has announced that every student will receive 10% extra credit if 90% of students turn in course evaluations. O The instructor has announced that every student will receive 10% extra credit if 80% of students turn in course evaluations. O The instructor has announced that every student will receive 5% extra credit if 100% of students turn in course evaluations