All truths are tested in practice, and relativity is the truth, so relativity is tested in practice. Which of the following reasoning has the same structure as the above reasoning? ['All nouns are real words, verbs are not nouns, so verbs are not real words.', 'Metals are conductive, and carbon is metal, so carbon is conductive.', 'Whales breathe with their lungs, seals may not be whales, so seals may not breathe with their lungs.', 'All fine grains are not high-yield crops, because all potatoes are high-yield crops, and all fine grains are not potatoes.']