One import and export company exported a batch of goods under CIF term. The seller delivered the goo

ds on board the vessel on time and made out all necessary documents. But the vessel stranded and sank in a few hours after departure. The next day , when the seller asked for payment with all set of documents in conformity with the contract, the buyer refused to accept the documents and rejected payment because his goods have been lost.

Question: Is it reasonable for the buyer to do so？ Why？

(Translate the case into Chinese and then answer the question)

Helpful hint: The case is mainly about the CIF term.