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B is corrent. A negotiable instrument must, among other requirements, contain an unconditional promise or order to pay a fixed amount in money. Since the maker has the option of delivering goods rather than paying money this would render the note nonnegotiable.
A is incorrect. The note is considered to have a fixed amount despite providing for collection fees.
C is incorrect. The signature requirement is met by any symbol or method intended to represent a signature. Thus, the use of a rubber stamp would not affect negotiability.
D is incorrect. Although the instrument must be payable on demand or at a definite time, this may be subject to acceleration at the option of the holder without affecting negotiability. Furthermore, the 10% prepayment penalty can be calculated and does not destroy negotiability.