the least lazy / the laziest

Hello!
I have to choose the correct words.
Joseph is the least lazy / laziest person.
Of course, the 2nd option is correct but what about the 2nd option? Could it be correct, too?
Thank you for your time and support!

Correct:
Joseph is the laziest person.
Joseph is the least lazy person.

Incorrect:
Joseph is the least laziest person.

‘The laziest person’ and ‘the least lazy person’ not being the same in meaning, I wonder how they were given as choices.

I’m not sure they were. I suspect the question is ambiguous but have attempted to clarify matters with my answer.