There is no set limit on how many response options can be marked as exclusive. You can set any number of answer options as an exclusive option by following these steps: Click on the answer option → Click on the dropdown → Check the "exclusive option" box.
Refer to the screenshot: https://prnt.sc/boNLXPLDFZGM
Helpfile for Exclusive options: https://www.questionpro.com/help/multiple-choice-exclusive-option.html