Answer: stage 2.
Step-by-step explanation:
When we are talking about the theory that involves the comparison of infant death rates and birth rates then, what comes into mind is the demographic transition. Demographic transition has 5 stages which includes the following;
(1). Stage 1 : where the infant death rate and birth rates are high and the natural increase is stable.
(2). Stage 2: where we have the death rate falling rapidly and an increase in the birth rate.
(3). Stage 3: where the birt rate falls and the death rate also continue to fall.
(4). Stage 4 : both the birth rates and the health rates are low.
(5). Stage 5: at this stage the death rate is still low and the birth rate increase.
From the question; Country x has a crude birth rate of 40 and a crude death rate of 15. The birth rate increases,that is 40 and the dealth rate is low, that is 15 for the Country which means that the country's demographic transition is STAGE 2.