K The accompanying data set gives, for the years 1960 to 2017, the fertility rate (average number of children per adult woman) in the United States. Construct a time plot to investigate a possible trend over time and comment briefly. Click the icon to view the fertility rates. Year Comment on the trend over time. Year OA. Fertility rates increased at a steady but low rate from 1960 to 2005, then increased sharply. OB. Fertility rates decreased sharply from 1960 to 1975, and have been roughly constant since then. Fertility rates decreased sharply from 1960 to 1972, and have decreased at a steady but low rate since O C. then. OD. Fertility rates decreased sharply from 1960 to 1970, were roughly constant from 1970 to 2008, have decreased sharply since then