We're being dishonest with answer C: "counterfeit" was in use long before Shakespeare's time. In fact, it first came into use in the 14th century, as stated in answer B. It traces to the Latin root "facere," meaning "to make" or "to do," and made its way through Anglo-French before being picked up in English. English speakers put "counterfeit" to use not only as an adjective, but also as a verb (as in "criminals counterfeiting twenty dollar bills") and a noun (as in "a valuable document that turned out to be a counterfeit").