I would think a b c d so 25% O he made a mistake znd forgot to take the bubble answer out. Now we only can pick between aord b c so it would be 33%

Seems my logic is wrong iff i read the rest

60%

Any answer is correct as long as you don't pick it at random. I'd choose (a) because I'm too lazy to read the other options

The answer is clear

I choose 75%

B) 60% because I'm generally very lucky.

There is absolutely no way it is 60%. Because you can never have 60% chances of picking anything particular when there are only 4 choices. Knowing this, the answer is either 25% or 50%. Two effective choices, so the answer is C, 50%.

Can I take a 50/50 joker first?

Yes

Selecting not at random, A xor D must be correct, because the answer key can only have one correct answer so even duplicate right answers must also be wrong.

Great! I'll hand this to my daughter to annoy her co-students who struggle with probabilitiy ;-)