Traci can take one of 3 different buses to and from school (bus A, B or C). She randomly catches one bus in the morning and another one on the way home. This table lists the sample space of outcomes.

Afternoon
A B C
Morning A AA AB AC
B BA BB BC
C CA BC CC

In the event AB, Traci rides the A bus in the morning and the B bus in the afternoon.
Which outcome would be included in the event "rides bus ONLY ONE way"?

A. BA

B. BB

C. CA

D. CC