I dissolved my S corp in 2019 but it keeps asking me to enter an answer to the question: "If disposed of S corporation shares in 2019, check one". What should I do?

You should do exactly that and "check one". Now what "one" is I have no clue, since you didn't provide any further information to work with.

Thanks for the quick response! Sorry, they the amount of characters I could use in my original message. These were the options:

1. Check if complete disposition in fully-taxable transaction (complete lines 2 through 9)
2. Check if disposition other than sale (see help)
3. Check if sold on installment basis (complete Form 6252, do not complete lines 2 through 9)

It seems like none of these are fitting since this, is the explanation for "b":

Other dispositions include:
- Gifted interest
- Transferred interest so that it was not taxable
- Sold your interest to a related party

In the regular K-1 form it allowed me to select "None of the above". Any ideas?

A few additional facts would be good:

• You indicate that you dissolved  the S corporation.  Did you sell any of the assets, either tangible or intangible to a third party?
• Did you distribute any assets to shareholder's?
• What was the liquidating distribution; only cash, assets, etc.
• Have you maintained a basis schedule of your basis in the S corporation?

Did you sell any of the assets, either tangible or intangible to a third party?

No

Did you distribute any assets to shareholder's?

Yes, everything remaining, to the only shareholder - myself 

What was the liquidating distribution; only cash, assets, etc.
Only cash

Have you maintained a basis schedule of your basis in the S corporation?

I don't believe so

Thanks!

What did you wind up doing?
I have the exact same situation!

I believe the accountant told me to select "Check if disposition other than sale (see help)" because it wasn't a sale. Their help section was just inaccurate.

Thanks for the reply - that's what I went with.