Also, I didn't really understand this one, where the phrase in question is "I wish to opt out of receiving exclusive promotional offers and updates about products I might be interested in." How does unchecking this result in an opt out? I can't figure out how to read this to make "[x]" mean anything other than "opt me out of offers and updates."
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What this means:
When checked: They will send you marketing emails. Uncheck to stop promotional emails.
How it tricks you: They use 'opt out' and 'wish' to create a double negative - saying no to opting out means saying yes to emails
Edit: oh I see. I got confused by the triple negative! The "correct" answer is indeed to keep it checked, but the instructional aspect of the page as a whole implies that you need to uncheck the box to have succeeded (aligning with the mistake). I think starting with the box unchecked might be a little more clear for the purposes of demonstrating.