The matter _____ your study surely requires _____ carefully.

1首先，定语从句

The matter （which relates to ）your study surely requires dealing with carefully.

which省略，就用relating to

2relate to不被动
某事涉及到某事（某人），就像happen，take place ，spread（这个会有被动的情况..），中文虽然又被涉及，被发生，但他们不用被动语态，所以BC的被动语态方式不对

1.relate A(to B) 联系；把。。。联系起来
I found it difficult to relate the two ideas in my mind.
2.relate sth(to sb) 叙述；讲述
She relates her childhood experiences in the first chapters.
3.relate to sth/sb 1)涉及：与。。。相关；谈到（用于relate to sth) The passage relates to the political view of herself. 2)了解；体恤(用于relate to sb) Many adults can't relate to children.

3主语是the matter，所以其实是the matter requires...

require+doing，主动表被动
require +to be done

另外want，need...都是这样，要么+doing，幺么+to be done
就是 某事需要被做，想要被干，需要被弄...都是这2中形式

The bike needs repairing
The machine wants repairing

希望有帮助