Whose Attitude Will Best Predict His or Her Behavior in Selecting

Whose attitude will best predict his or her behavior in selecting one class over another?

A) Margy, who is ambivalent about which class to pick
B) Aja, who knows which class he should pick but is not especially happy about it
C) Rosalinda, who would be happy to take either course but is not sure which would be better, career-wise
D) Tomi, who has long known what class she wants to take and can usually pick her classes easily