Please answer the following:

QUESTION 7 The next three questions refer to the following situation An oil company wants to create lube oil, gasoline and diesel fuel at two refineries. There are two sources of crude oil. The following Excel spreadsheet shows this problem. C D E F G H K L M N O Unit Net Supply/ 9 X Flow from Node Yield Flow into Node Cost Nodes Flow Demand 10 Crude A 0.90 3 Refinery 1 15 Crude A 120 Crude A 0.85 4 Refinery 2 13 2 Crude B 60 12 2 Crude B 0.80 w Refinery 1 3 Refinery 1 0 2 Crude B 0.85 Refinery 2 1 1 4 Refinery 2 0 14 3 Refinery 1 0.95 U Lube Oil 4 U Lube Oil 75 15 3 Refinery 1 0.90 5 Gasoline 6 Gasoline 50 16 3 Refinery 1 0.90 Diesel 7 Diesel 25 17 4 Refinery 2 0.90 U Lube Oil 3 18 4 Refinery 2 0.95 6 Gasoline 9 4 Refinery 2 0.95 Diesel 6 20 21 Total cost In the provided blank, insert the letter that corresponds with the correct answer. For example, if the correct answer is "a. 2.5", insert "a" as the correct answer 4-1. What value would you enter in the "Objective Cell" of the Analytic Solver task pane for the above Excel spreadsheet? a. C10:C19 b. J16 c. J20 d. J21