Choice "A" is correct. The UCC does not follow the mirror image rule; instead, generally anything that looks like an acceptance will operate as an acceptance, even if it contains new terms. In such a case, a contract generally is formed even if the offeror fails to agree to the new terms. Thus, even though the acceptance contained an additional term regarding the weighing scale, it is an effective acceptance. Indeed, even if this contract were at common law, the acceptance probably would have been found valid. The requirement of a valid city certificate for the weighing scale probably would be considered to be an implied condition of the offer.
Thus, choices "d", "b", and "c" are incorrect.