Concept:The market chain moves step by step from raw material supplier to the final consumer. Each step adds value before the product reaches the buyer.
Explanation:The correct sequence starts when the farmer buys tomato seeds from a local trader (B).
Next, a wholesale merchant buys the tomatoes in the vegetable mandi (C).
Then, a small city-based food processing unit buys the tomatoes to make ketchup (D).
After that, a marketing company supplies the finished ketchup to retail stores (E).
Finally, Sona orders ketchup from a neighbourhood shop (A).
Answer: Option A (B, C, D, E, A)