Answer:
The correct answer is the last option: Are incomplete.
Step-by-step explanation:
To begin with, in the microeconomics theory the concept of preferences are refered to the situation in where the person has to decide between alternatives in order to obtain one of them that will, in theory, maximine his satisfaction. Moreover, with the purpose of being completely rational these preferences have to fullfil another mathematics characteristics such as being transitive and complete. So in the case presented when Jane is trying to decide which courses to take and she just can not decide, then that would be because the preferences are incomplete.