require that和　require to

for instance:

OG 138. 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

if the word"should" of the answer (A):"that employers should retain all older workers" was ejected  , whether (A) would be the best answer in that (E) has changed the logical meaning of the original sentence?

The idiom "require that" invovies  the subjunctive mood  but does not "require to".

IS "require to " prior to "require that'?

help THX in advance.

THX

I have got another question.

^.^

Does "require to" invovle the subjunctive mood  ?

THX^.^

如果　ｒｅｑｕｉｒｅ　ｔｏ没有包含虚拟语气　，而且　又有去掉　ｓｈｏｕｌｄ的A的答案，　那　A是不是符合没有改变句子逻辑含义的规则呢？　如果选 E　则　改变了句子含义了。