Option C is a bit too specific, focusing on the purchasing process. The business cycle is about the broader economic trends, so I agree that B is the correct answer.
Haha, option A sounds like the delivery time, not the business cycle! We need something that covers the whole economic process, so I'd say B is the winner.
Option B seems to cover the entire economic cycle, from raw materials to finished goods. That's a pretty comprehensive description of the business cycle.
Giovanna
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