The lesson seems clear on when to use the article in a date, but questions don't make it clear which is called for. That needs to be cleaned up...........
I checked all the questions but none of them have in the set of answers any that uses the correct form of saying the date with the article "el" so there shouldn't be any other alternative but the one we set as correct without the article. Some answers have the article but then they are missing something else or is in the wrong order, so that makes them incorrect.
I hope this clarified it.
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