On "Explain Your Thinking" When Correct

Hi!
I would like to display the text box for “explain your thinking” ONLY when the correct option is chosen from multiple choice. Can anyone help me do this? It was quite the time figuring out how to give feedback on their screen to begin with, so bear with me, I’m not a coder by any stretch.
Here’s my activity: Function or Relation? • Activity Builder by Desmos
Thanks!

EDIT: Nevermind, I changed it to a separate text input box and could use “hidden” then, and initial text to let them know they need to explain :slight_smile:

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It looks like you solved this but here are a bunch of feedback slides you might find useful.

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Oh that’s great, thanks!