[单选题]
What can we learn about marriage vows from t 3f -+sa8khdqdk io+t3he passage? q -6jyvetdzwhlb ; x2l./c)-s
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.
