Let's check the probability of each event:
Event 1: Spinner B lands on a red slice.
Event 2: Spinner B lands on an orange slice.
Event 3: Spinner A lands on a white slice.
Event 4: Spinner A lands on an orange slice.
Summary of the Events Probability:
Event 1: 0.35
Event 2: 0.65
Event 3 : 0
Event 4: 0.50
Therefore, the order from least likely to most likely will be:
Event 3, Event 1, Event 4 and Event 2