The correct answer is D. Occassion. The correct spelling is occasion.
A procession is a group of people or vehicles moving in a formal or ceremonial way, typically in a line. A profession is a paid occupation, especially one that involves prolonged training and a formal qualification. Possession is the act of having or controlling something. An occasion is a particular time or set of circumstances.
The word "occassion" is often misspelled as "occasion." This is likely because the two words sound similar. However, the correct spelling is "occasion."
