Does it say anywhere to select two answers?
I wondered about that myself, when I saw the two sets of three mutually exclusive options each.
Previously, I have submitted questions with multiple answers and deliberately not mentioned the number of correct answers (because that would be a hint I did not want to provide). And then was disappointed to see that number being added (by the site's program? the editor? faeries?) when the question went live.
It looks like that process is now no longer in place, and it is left to the question author to decide whether or not to tell the reader how many answers are correct.
(Note that you can still see from the use of tickboxes that there is more than one correct answer)