Everyone will admit that swindling one's fellow beings is a necessary practice; upon it is based the really sound commercial success formula — ___.
Explanation:
'Buy cheap and sell dear' is the only option that will, without any doubt, lead to a commercial success. (d) gives an unwarranted warning. (a) is not sound commerce. (b) is needlessly verbose, as compared to (c). (c) sounds like a formula, it is also the best choice after the hyphen.
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