Dr. Arceneaux wants students to take advantage of online practice quizzes on their course site. Which of the following is the least effective plan to increase the number of practice quizzes completed?
a) Sending reminder emails to students about the quizzes.
b) Offering bonus points for completing a certain number of quizzes.
c) Making the quizzes longer and more difficult.
d) Providing incentives such as small prizes for high quiz scores.