选B
（1）pay的基本意思是“支付”,作为及物动词,宾语可以是“人”、“钱”.如：
He paid the taxi and hurried to the station.他付了出租车的钱,急忙向车站赶去.
They had to pay two hundred francs.他得付二百法郎.
We’ll pay you in a few days.几天后我会给你钱.
注：题目中的It指代的就是餐费,也就是钱了.
（2）pay for的宾语为“物”、“事”,for表示支付的原因.如：
You’ll have to pay me ten dollars a week for your meals.你得每周付给我十美元饭钱.