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A is corrent. Because the payment is subject to delivery of the computers, the time for payment is not a definite term, destroying negotiability.
B is incorrect because there is no provision in the law to allow a holder to ignore such a term on the draft in an attempt to maintain negotiability.
C is incorrect because a draft may be payable on demand or at a definite time.
D is incorrect even though Brush may control the time of delivery and thus the time for payment; the time is still not definite on the face of the draft. Note that if Brush had sold the draft immediately to another party, that party would not have a definite time at which they could expect payment. Thus, negotiability is destroyed.