[单选题]
What can we learn ab6 cx -m7sn1mu)u5n4af hzuwi+out marriaju8h/ kvd8vf( ge vows from the passage?
A. They may not guarantee a lasting marriage.
B. They are as binding as they used to be.
C. They are not taken seriously any more.
D. They may help couples tide over hard times.
