Most Research Regarding Marital Satisfaction

Most research regarding marital satisfaction

A) substantiates the "U-shaped" pattern,where marital satisfaction is high at the beginning,drops down around the birth of children,and then gradually rises back to its original high level.
B) brings the "U-shape" in question,suggesting that the upturn in the U-shape may be illusionary,and that marital dissatisfaction continues throughout life.
C) is not conclusive regarding the "U-shape" and marital satisfaction,but seems to substantiate that women are more satisfied than men.
D) is not conclusive regarding the "U-shape" and marital satisfaction,but seems to substantiate that men are more satisfied than women.