What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
From what I understand, you want the user to be able to select only one answer in each column? Unfortunately that is not possible for the matrix field. With the radio field, you can only limit the answer per row, not per column.
A possible workaround I could suggest would be to change the input type to Radio Button then interchange the column with the row, so that you have 4 columns and 2 rows.
With this setup, the user can only select one answer for the "Most" row, and one answer for the "Least" row.
Please let us know if you need further assistance.