Hi ​@AngieYYS7661,

It can be done by adding a small piece of JavaScript to your question. You can start by giving each answer choice a number (like: Choice A = 1, B = 2, C = 3… where lower numbers mean higher priority). When a participant selects multiple options, the script quietly checks those choices and picks the one with the highest priority. Then you can store that result in a hidden field called something like "HighestPriorityChoice", which you can use later in the survey. Here is the JS code:
 

Qualtrics.SurveyEngine.addOnPageSubmit(function() {
  const priorities = {
    1: 3,  // Choice 1 = Priority 3
    2: 1,  // Choice 2 = Priority 1 (highest)
    3: 2   // Choice 3 = Priority 2
  };

  const selected = this.getSelectedChoices();
  let bestChoice = "";
  let topPriority = Infinity;

  selected.forEach(choiceID => {
    const priority = prioritiesochoiceID];
    if (priority < topPriority) {
      topPriority = priority;
      bestChoice = this.getChoiceText(choiceID);
    }
  });

  Qualtrics.SurveyEngine.setEmbeddedData("HighestPriorityChoice", bestChoice);
});

Just update the priorities part to match your own choices.

I hope it helps.
-- Rochak