请教一个单选题so much so that与so much that的区别

Question

This child is born a mathematician. He loved mathematics____ he will spend a whole day solving mathematical problems without remembering to have meals.
A) and so B) to the extent that C) so much so that D)so much that
参考答案是C，请教高手，B和D为什么不对，后三项之间有何区别？多谢！

Answer 1

这句话你可以拆开来看，那样就清楚点
He loved mathematics so much
so that he will spend a whole day solving mathematical problems without remembering to have meals.

如果你选D，那后面从句得用过去式，从句要与 主句时态一致嘛
不选B的道理也差不多

Answer 2

因为so much so that 是一个固定的短语，意思是到这样的程度以致...
D不对 短语搭配应该是 so.....that.....意思是如此....以至于....
至于B，可能是和will的搭配不对吧，不确定。

Answer 3

so **** that 本来可以表示 足够*** 以至于 的意思
但句子中 so 是very的意思
句子相当于
mathematics_ very much so that he will