Which of the following chemical reactions is not an oxidation-reduction reaction?

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Which of the following chemical reactions is not an oxidation-reduction reaction?

Chemistry
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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for some reason, i got the first one wrong on my test...

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I think it's A, but idk how to explain why
@Jadeishere i thought so too but idk why they marked it wrong! ):
I would say C. Is it correct?
So oxi-red reactions charge from one side to the other, and A does do that with Ba... Wow, now I know why it's wrong
The best way to answer this kind of (defition related) questions is to understand what the definition means, and learn about it. Here is a link that will give you the answer (and more): http://www.shodor.org/unchem/advanced/redox/
@Jadeishere @Hoslos so we agree on C?
Let me explain. Oxidation-Reduction reactions are the one in which from reactants to products side, there has been loss and gain of electron in at least 2 different elements. NB: The oxidation number of an element in its standard state is 0. C answers it because at the reactants side, Zn has oxidation number 0 and on the products side, has oxidation number +2. On the other hand, the Zn could have lowered its oxidation number on the products side, given that the oxidation number of S can also change, affecting the Zn's. Hydrogen in the reactants side had oxidation number +1 and in the products side, 0. Meaning, it reduced. Zn also appeared to reduce. At the end of the day, we cannot find the element which oxidized, hence it is not an oxidation-reduction reaction.
it was actually wrong )): @Hoslos
Then the answer must be A. Because in both B and D, the reactants had 0 oxidation numbers and in the products side, one of them increased and the other reduced, making them reduction - oxidation reactions.

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