If someone was born in the 1960s, then he must have read Chairman Mao's quotes. Li Tong has read Chairman Mao's quotes. then? ['Li Tongding was born in the 1960s.', 'Li Tong could not be born in the 1970s.', 'Li Tong may have been born in the 1990s.', 'Li Tong may be born at any age.']