I believe this is what you're looking for.
a, c, and d are all chemical properties because they give information about how a substance will behave in the given reaction, and can’t be found without the substance undergoing some sort of chemical reaction. b, on the other hand, is a physical property—it can be determined without changing the substance’s chemical composition.
Answer:
B. Reduction occurs at the cathode.
Step-by-step explanation:
That's the <em>definition</em>: The cathode is the electrode at which reduction occurs.
A is <em>wrong</em>. The cathode gains electrons through the external circuit.
C is <em>wrong</em>. The cathode has the electrons, so cations move toward it.
D is <em>wrong</em>. Reduction occurs at the cathode, so the oxidation number decreases.