Rosanna, age 65, describes her 40-year marriage to Rodolfo: "For the first few years, it was wonderful. We were so in love. Then, during the next decades, things became rocky until the kids left the house and we fell in love again." According to the U-shaped curve of marital satisfaction, this marriage is:

a) prone to fall apart in the old-old years.
b) unusual.
c) typical.
d) destined to get worse if Rosanna or her husband become ill.

Ans: c) typical.