79 passed. This was an extremely basic multiple choice test.
It makes one wonder how the other 4,581 were smart enough to
operate a web browser in the first place.
As for the question itself, that's simple: people come for the money, and since "Turkers" are paid pennies for those tasks that means they have to do a lot of them; so replying randomly on a test is a no-brainer (I wouldn't even bother to click and type and just write a script).
It's a good thing we've got these magazines reminding us how we are so smart and the rest of the world is so stupid. What would I do without my over-inflated ego?