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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

答案是A，D为什么不对？
我觉得D中直接用名词the schedule比A中用it指代schedule更加准确；而且主句用一般过去时，没有线索表明从句必须用一般现在时（如A）