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						 Read the facts and the question and then choose the best answer. 
						A, a supplier, agrees to supply 30 kilograms of coffee beans each week to B, a cafe owner, for a price of $15 per kilogram. The next day A hears from a friend, C, that B is often very slow at making payment. When he takes the first consignment of coffee beans to B, A refuses to hand them over to B unless B pays her at the same time. 
						Is A entitled to insist on payment at the same time as delivery of the article to B? 
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