Which of the following plots in North and South show Gaskell’s view on marriage that love is the solid foundation of marriage? （ ）.

A、Margaret never accepts a marriage without love. She refuses two men’s proposals just because she is not in love with them
B、Margaret and Thornton together experience the difficulties and face the challenge. It is in this way that love builds the everlasting marriage
C、Margaret and Thornton change their perception of themselves and each other before they fall in love
D、Margaret gives a close attention to the misery of working class