一道SaT语法,帮忙解析一下A和B两个选项的区别

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although：while这两个连词都可用于让步结构,但两者所连接的句子的主从关系恰好相反.（注：though与while也是这样)比较：Although it looks like a huge monster,that country is in essence a paper tiger．虽然看起来像个庞然大物,那个国家在本质上却是一只纸老虎.While it is in essence a paper tiger,that country looks like a huge monster．尽管本质上是只纸老虎,那个国家看起来倒像个庞然大物.
可是这道题太多生僻词,真是难
SAT的考生真是不容易
======以下答案可供参考======
供参考答案1:
B. while: during the time thatmetamorphesis: the process of transformation from an immature form to an adult form in two or more distinct stages. while的意思是在那个期间.
metamorphisis的意思是改变. 像蝌蚪变青蛙那样
整个词的意思是 蝌蚪在孵化和改变的期间会留在他们的出生地点