Well I would say do an event that is most signifigant to you. It could be a Tragic or Happy memory, or one that is simply close to your heart.
A i think
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the answer is definitely b :)
The only word that could potentially be a compound noun is patents, but that has its own definition-a government meeting of some sort.
A compound noun would be a compound word that is also a noun, but there aren't really any compound words.
I know this doesn't really help, sry.