Sentence Correction

99.Although the manager agreed to a more flexible work schedule, he said that it must be posted on the bulletin board so that both management and labor will know what everyone is assigned to do.
(A) he said that it must be posted on the bulletin board so that both management and labor will know what everyone is
(B) he said it had to be posted on the bulletin board so that both management and labor knows what everyone is
(C) he said that they would have to post the assignments on the bulletin board so that management and labor knew what everyone was
(D) he said that the schedule would have to be posted on the bulletin board so that both management and labor would know what everyone was
(E) saying that the schedule had to be posted on the bulletin board so that both management and labor would know what everyone had been


OA [A]

Will please someone tell me why it should not be D; D seems alright looking to the tense "he said".[/spoiler]

I believe "said" is used as the present tense in this sentence so the the "was" in choice D does not agree. Choice A uses "is" so that's the correct answer.