1) require a response for fields 'B' and 'C' in the Matrix Table question
2) require the response for fields B&C above in #1 only if the field 'A' in the row is populated
3) compare the values of fields 'B' and 'C' to ensure a match.
This is only a single question in an existing Qualtrics form, so it should not take long.
4 freelancer bu iş için ortalamada 73$ teklif veriyor