Answer:
A. increasing average age
Step-by-step explanation:
China's one-child policy was part of a birth arranging program intended to control the extent of its populace. Particular from the family arranging strategies of most different nations (which center around giving prophylactic alternatives to enable ladies to have the quantity of kids they need), it set a point of confinement on the quantity of children parents could have, the world's most outrageous case of populace arranging. It was presented in 1979 (following 10 years in length two-kid policy), adjusted in the mid 1980s to permit provincial guardians a second tyke on the off chance that the first was a girl, and afterward kept going three additional prior decades being disposed of toward the finish of 2015.
The strategy likewise permitted exemptions for some different gatherings, including ethnic minorities. The term one-kid arrangement is consequently a misnomer, in light of the fact that for almost 30 of the 36 years that it existed (1979– 2015) about portion of all guardians in China were permitted to have a second child.