4 is B
This question requires a careful reading of the possible answers. At first glance, item I appears reasonable, except for the answer's “requirement” of the instrument being signed by both the drawer and the drawee. Because only the drawer must sign the instrument, item I drops from possible consideration. Notice, however, that the remainder of the conditions in item I are correct in the definition of a negotiable instrument.
In item II, the remaining definitional elements of negotiability are met, and since this answer has no conflicting elements, it is the preferred answer.
In general, a negotiable instrument requires the instrument or document to be signed by the drawer, contain an unconditional promise or order to pay, must be a fixed (or determinable) amount of money, and it must be payable either to the order of, or to the bearer.