Ms Hajra Riaz is attempting to decide whether or not to drop a course she is currently enrolled in "Financial Management". If she does, she will forfeit the money spent on tuition. Which of the following statement is/are true?

I. Remaining in this class means less time for studying for her accounting course--thus, staying in requires that she incurs opportunity costs

II. The tuition cost is irrelevant to the decision

III. Whether or not she drops the course, she cannot sell the textbook back to the college bookstore--therefore, it is a sunk cost.

a. I only

b. I and II only

c. II and III only

d. I, II, and III only

e. None of the above.