That every worker has a clean criminal record is of some importance to

That every worker has a clean criminal record is of some importance to investment banks which is why a stringent background check is a necessary prerequisite for all of their job applicants.


(A) That every worker has a clean criminal record is of some importance to investment banks which is why a stringent background check is a necessary prerequisite for all of their job applicants.
That every worker has a clean criminal record is a noun clause that correctly uses verb ís'. However, óf some important is better written as just important.
'which' has to modify the preceding noun.
Also, I feel 'necessary' is redundant, as prerequisite itself means 'required prior condition'.

(B) Clean criminal records of their employees is important to investment banks; hence, a stringent background check are necessary prerequisites for employment.
'a stringent background check' should take singular verb ís'. Also, 'Clean criminal records of their employees' should take verb áre'.

(C) Because they consider it important that all of their employees have a clean criminal record, investment banks require each job applicant to undergo a stringent background check.
'Because' is correctly joining two IC, and this option removes all other errors.

(D) It is of some importance that all investment banks’ workers have clean criminal records which is why many of them undergo stringent background checks.
D is pretty awkward in its construction, and can be eliminated immediately.

(E) The reason that investment banks require background checks of their applicants is because they require clean criminal records of their employees.I think it should be C(best possible in avail ans)...
use of reason and because together is unnecessary

C