even if和although用法的不同?

问题描述:

even if和although用法的不同?
____there is enough food in the world for everybody,not everyone can afford to buy it.
A.Although B.Even if
.谁能告诉我为什么不能选B以及它们的区别.

B的意思是即使
A的意思是虽然
你用中文想想就知道为什么选a