Well the four options, being a, b, c, or d, would be 25% each. Seeing how 25 times 4 is 100. So 25%, no matter wich one you choose. But as a great life lesson in life, if you must guess, pick c.
There's two "25%" options, so if "25%" is the correct answer, then you have 50% probability to guess right
Oh well, I'll just post the solution. You would guess that, having 4 choices, if you chose one randomly you have a 1/4 probability to chose the correct one, and therefore the answer would be "25%": but there's two "25%" options, so if that's the correct answer, you actually have a 50% probability to catch it, not 25%! Ok, then... the answer must be "50%"! But... there's only one "50%" option out of four, so if that's the correct answer, then the probability to chose that randomly is 25%, not 50%. Uhm. What about D? Maybe it's just impossible to give a correct answer, and therefore the probability is just 0%! It makes perfect sense! But... if "0%" is the correct answer, then you have... an actual 25% probability to catch it by chance. wattaffuq. The question is just ill posed. It's not that there's no way to answer correctly (if that was the case, then "0%" would be correct - but that would be contradictory, as shown): it's more like that the question itself doesn't make any sense. It's not a question with no correct answer: it's a non-question. And if you try to answer a non-question, anything you say will just be bullshit. Anything. (trolol) p.s: if there's any lesson at all to learn from this, it is that sometimes*, when it seems you can't find an answer to a question, maybe you should reconsider the question in the first place. *I said sometimes: don't use this as an excuse to avoid answering a perfectly well posed, but difficult, question. And if you find a truly ill posed question, maybe a better idea would be to rephrase it, rather than just dismissing it: that would be an awesome opportunity to understand something new.