The event that is most likely to be characterized by frivolity is A. a picnic.
Frivolity simply means something that's enjoyable, fun, and it's also a lack of seriousness. Frivolity can also be used to refer to something that's not important.
A study session, a doctor's appointment, and a trip to the supermarket are important things. Therefore, the unimportant thing will be a picnic.
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