Doing taxes - Independent Contractor work (Prolific) - what NAICS (business) code is best?

Sorry for the dumb question! I'm new to this and it's been a learning experience. I've been hunting through the codes for a probably an hour now and I can't decide on what would be the right code. I've looked through the FAQs and such on here, but either there's really no info or I'm overlooking something under my nose.

My only income last year was from Prolific studies and they specifically state that it's independent contractor work. I still need to use a business code going this route and I cannot decide for the life of me what's best. Can anyone here shed some light on this? Thanks!

submitted by /u/Asunderstorm
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source https://www.reddit.com/r/beermoney/comments/11li5bz/doing_taxes_independent_contractor_work_prolific/