Which of the following statements is true?

a. contrary to the stereotype, most college students do not procrastinate
b. contrary to the stereotype, most college students do not procrastinate, and among those who do it rarely leads to academic problems although
c. almost every college student procrastinates, very few do so to the degree that it leads to academic problems although
d. almost every college student procrastinates, over half procrastinate so much that it leads to academic problems