@Andrew22 , It’s been a few years, so you may have found a workaround already. If so, you can mark the answer as accepted, and close the question. If not, there is this you can try for the red box part of your question: 

Qualtrics.SurveyEngine.addOnload(function() {
  // Set the index of the choice to highlight
  const highlightedChoiceIndex = 2; // Change this to the index of the choice you want to highlight (0-based index)

  // Get the question container element
  const questionContainer = document.getElementById('QID1'); // Replace 'QID1' with the actual question ID

  // Get the choice elements within the question container
  const choiceElements = questionContainer.querySelectorAll('.ChoiceStructure tbody tr');

  // Loop through the choice elements
  choiceElements.forEach(function(choiceElement, index) {
    if (index === highlightedChoiceIndex) {
      // Add a red border to the highlighted choice
      choiceElement.style.border = '2px solid red';
    }
  });
});
 

In the code above, make sure to replace 'QID1' with the actual question ID of your multiple choice question. Also, adjust the highlightedChoiceIndex variable to the index of the choice you want to highlight (0-based index).

This code assumes that the choices in your multiple choice question are structured within a table (.ChoiceStructure). It selects the choice element at the specified index and applies a red border to it using the style.border property.

Remember to place this code within the appropriate location in your Qualtrics survey script, such as the JavaScript section of the question or the survey header/footer.