I have to offer my apologies for this question. I don't know what went wrong. I always check my question, answers and explanation several times before submitting, but I don't keep screenshots - so I cannot check if I really did mess this one up, or if something changed the data I submitted.

The question should of course have read "check THREE answers". And the correct answer options should have been 1, 4, and 5, as explained in the explanation. I'll contact Steve and ask him to correct this as soon as possible.