Infant mortality in a society is a recognized sign of its overall health. Although infant mortality in some parts of the United States is higher than in many developing countries, the overall U. S. rate has been declining, but this decline does not necessarily indicate that: Now, American babies are now healthier than they were when they were born. Which of the following, if true, would best support the statement made above regarding the decline in infant mortality? ? ['Infant mortality data as a whole masks shortfalls in special regions.', 'Low birth weight is the leading cause of death in half of U. S. infants.', 'Most premature and low birth weight babies need to stay in the hospital for a longer period of time, and the United States has developed and has superb technology in this regard.', "Babies who can't get enough care from the caregiver can't grow healthily, so they gain weight slowly."]