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C(C is correct. Iron (III), Fe3+, and sulfide, S2-, combine to give an equal number of positive and negative charges, hence there are two Fe3+ ions and three S2- ions in the formula, Fe2S3. These molecules are Iron II sulfide, Iron disulfide/persulfide, which is arranged Fe-S-S, and Fe3S2 is formed in response to very high pressures, which are not described in this passage and is unlikely to form.)
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