Dr Arceneaux Wants His Students to Take Advantage of Online

Dr. Arceneaux wants his students to take advantage of online practice quizzes on his course site. Which of the following is the LEAST effective plan to increase the number of practice quizzes completed

A) 1 bonus point for every 2 online practice quizzes completed
B) 5 points deducted from course total if no quizzes are completed
C) 1 bonus point awarded every 2 weeks if 2 or more quizzes have been completed
D) 1 bonus point awarded every now and then (about 2 weeks on average) if 2 or more quizzes have been completed recently