In 2016, Janet Jackson Became Pregnant for the First Time

In 2016, Janet Jackson became pregnant for the first time at the age of fifty. Which sociological trend does her pregnancy fit into?

A) The average age of first pregnancy is rapidly decreasing.
B) Women are more likely to wait until they are married to get pregnant.
C) The birth rate has decreased sharply since World War II.
D) The number of births to women over thirty has increased dramatically.