Answer: Refined's place of business
Explanation: The UCC stands for Uniform Commercial Code and represents a set of business rules which is aimed at regulating business transactions. It serves as a legal contractual skeleton guiding business dealings between the transacting parties. In the scenario above, since the place of delivery was not stated, in this situation acoording the Uniform Commercial Code standard, the delivery will take place at Refined Grain Inc.'s place of business.