Just as relaxation is an important part of our lives,---- st

7. Just as relaxation is an important part of our lives, ?____?stress.
　　A.so is B. as it is C. and so is D. the same is
just as...,so... 如同…,也是…”.
Just as relaxation is an important part of our lives, so is stress.
正象休闲一样,紧张也是我们生活中的一个重要部分.