In the United States, the average survival time of cancer patients, that is, the period from diagnosis to cancer to death is 7 years, while the average survival time of cancer patients in Asia is only 4 years. Asia. Which of the following? If true, the above argument can be weakened most. ['Americans are generally more aware of self-care than Asians, so the rate of early diagnosis of cancer patients in the United States is higher than in Asia.', 'Americans live longer than Asians.', 'The average survival time of cancer patients in Asia and Japan is 8 years.', 'The incidence of lung cancer with the shortest life expectancy among patients with various cancers is higher in the United States than in Asia.']