The minimum cost of sending one unit from any refinery to any district is:
Explanation:
The cost of transporting one unit from refinery BD to depot AE is Rs. 0 and the cost of transporting one unit from depot AE to district AAB is also Rs. 0.
∴ The minimum cost of transporting one unit from any refinery to any district is Rs. 0.
Hence, option (a).
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