Normally you’d have a 1/4 chance of picking the correct answer.
But two of the answers are the same.
So you’ve got a 2/4 chance if the answer is 25% of getting that correct.
So what was the question?
“So you’ve got a 2/4 chance if the answer is 25% of getting that correct.”
No, because if you have a 2/4 chance (50%), then 25% is no longer the correct answer. If 50% is the correct answer, then you only have a 25% chance to pick that at random, which means that 50% is not the correct answer either.