Command Subjective

Senator Lasker has proposed legislation requiring that employers should retain all older workers indefinitely
or show just cause for dismissal.

(A) that employers should retain all older workers
(B) that all older workers be retained by employers
(C) the retaining by employers of all older workers
(D) employers' retention of all older workers
(E) employers to retain all older workers

Guys ,

If i use command subjective then is option B right?

If i use Idiom the i think Option E follows

OAE

I want to know what's wrong with B .

Pls correct me.