B is corrent because generally, if an instrument contains a promise to do any act in addition to the payment of money, it is nonnegotiable. An exception to this rule occurs when the additional promise concerns providing security for the instrument. Granting to the holder an option to purchase land is an additional promise that does not concern the providing of security. Consequently, this second promise would destroy the negotiable aspect of the instrument. A is incorrect because an instrument that is payable in foreign currency is considered to be a fixed amount in money even though the exchange rate might fluctuate from day to day. C is incorrect because a negotiable instrument may be made payable at a definite time subject to acceleration at the option of the holder. D is incorrect because even though a negotiable instrument must contain an unconditional promise or order, it is permitted to limit payment out of a particular fund or source such as assets of a partnership.
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