Some Research Suggests That Marital Satisfaction Over a Lifetime Appears

Some research suggests that marital satisfaction over a lifetime appears to follow a U-shaped curve; this means that

A) satisfaction is lower in the early years of a marriage and then again in late adulthood.
B) satisfaction is highest in the early years of a marriage and then again in late adulthood.
C) there is a "normal distribution" of satisfaction throughout marriage.
D) most marriages worsen over the years.