—Would you like to come to my house for dinner tonight?

—I'd love to, _____ I have lots of work to do. [ ]

A. so

B. or

C. and

D. but

贴现金融证券也称贴水债券，是指银行在一定时间和期限内按一定的贴现率以高于债券面值的价格溢价发行的债券。