-- How much are these shoes?---75 yuan for leather.---That's

-- How much are these shoes?---75 yuan for leather.---That's a real_______.
A.sale B.bargain C.business D.deal
答案给的是D,但我不知道B哪里不对,
我知道有It's a deal!一言为定,成交 的意思，但前面可以有real修饰吗？不是有That's a real bargain.意为真便宜吗？
That's a real bargain
A Dublin lawyer died in poverty,and many people donated to a fund for his funeral.The Lord Chief Justice of Orbury was asked to donate a shilling."Only a shilling?" said the Justice,"Only a shilling to bury an attorney?Here's a guinea; go and bury twenty more of them.'这里也没有讨价还价呀。