The correct option is D Both A and B
Sex Ratio in India is declining due to several factors. Out of these most common are the preference for the male child due to social, economic and religious reasons. Infant mortality is higher among girls because of lack of proper medical facilities. Pre-natal sex determination tests have led to large scale practice of female foeticide.
Natality is simply the birth rate irrespective of the male or female child. Thus, the correct answer is option D.