This hasn't been determined.
There was a new review in some publication where they have pretty much concluded that it was wildlife related, and likely narrowed down to a single stall in one of those markets...
This isn't the article I read, but looks like it's the same research...
The latest research points to a spillover from animals at the Huanan Seafood Wholesale Market in Wuhan. The world could take steps to prevent this from happening again.
www.vox.com
There were at least three different critters cited as potential vectors of the early outbreaks in the report I read, with the author claiming to have been at that market sometime in the pastand witnessing conditions similar to those photographed and reported as evidence supporting this theory... The author of the article I read also mentioned that poultry was likely a factor as well. I think I saw mention of that in the VOX article linked.