All metals are conductive. Copper is conductive, so copper is metal. Which of the following is most similar to the above inference structure? ['All birds are oviparous, and bats are not oviparous, so bats are not birds.', 'All birds are oviparous animals, and swans are birds, so swans are oviparous animals.', 'All those engaged in business management must study corporate management. Lao Chen is studying business management. Therefore, Lao Chen is engaged in business management.', 'Huashan is at risk to Huangshan, Huangshan is at risk to Taishan, so Huashan is at risk to Taishan.']