[单选题]
What can we learn about marriage vows f;c-ay6n*l g slrom 5fn 0c;hd bm:r b g*z63 6ywo2sfy9:u7lsiqbcthe 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.
