谁知道 how much 和however much的区别?

题目

谁知道 how much 和however much的区别?
有一道这样的题：
It is very intersting book .I'll buy it,________.
选项是：A how much may it cose
B however much it may cose 为什么选B?
能讲清楚他俩的用法和不同吗？

答案

how much提问什么要多少钱
however much 无论多少
逗号后添从句,how much 不用在句中,所以选B