From LimeSurvey Manual
Maximum columns for answers (max_col_for_ans)
This option limits the number of columns created in the database (more precisely, in the answers table). If you give a value lower than maximum answers option, then this attribute will represent the upper limit of the maximum choices a respondent can make.
- Any positive numerical value
- The default value is the total number of answer options your question contains. The number will be displayed after you activate for the first time the survey.