In the mountains of a country in Asia, newborns born in February and March are generally not as good as those born in other months. After investigation, staff at the local medical office believe that the main reason for this phenomenon is the lack of food in winter and pregnant women. Inadequate nutritional supplementation results in a weak newborn. Which of the following, if true, would best support the above findings? ['The few rich families in the mountain area that can provide sufficient nutrition for pregnant women still give birth to weak babies in winter.', 'The period that determines the constitution of the newborn is the nutritional status of the first half of the birth, not the nutritional status of the month.', 'Pregnant women in this mountain area generally suffer from a winter-onset disease, which can reduce their physical fitness and affect the health of their babies.', 'A few trace foods are generally lacking in the few winter foods in the mountain area, which is exactly needed by newborns.']