Which of the Following Statements Describes Changes During the Last

Which of the following statements describes changes during the last century in the number of children born per family unit?

A) The age at which women had their last birth is lower for women in the mid-1800s than it is for women from the mid-1900s.
B) Between 1841 to 1951, families reduced the time spent having and raising children by more than 10 years.
C) The number of years spent raising children is much higher now than it was in the 19^th century.
D) The age at which women of the 1970s cohort first marries is much lower compared to the age at first marriage of the 1960s cohort.