You have in effect a hypothetical condition about the present: If chocolate weren't so fattening, then I would eat ... The past subjunctive were is used for a present(or future) counterfactual condition, and would is used for a present (or future) consequence of such a condition.
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AnonymousI wish chocolate......... so fattening. Then I........ a box of chocolates every day.The question is faulty, but they want you to answer B.