Detailed Solution:
The correct answer is “Health”.
The ABC (Achievements of Babies and Children) index is related to health and measures the progress of states in improving the health and well-being of newborns, infants, and children under five years of age.
The index takes into account several factors such as neonatal mortality rate, infant mortality rate, under-five mortality rate, and proportion of underweight children, among others, to rank the states.
The aim of the index is to encourage states to take measures to improve the health of babies and children and reduce child mortality rates.