信息被译成能理解的一系列符号的过程属于沟通步骤中的 （）

A.信息源

B.编码

C.传递信息

D.解码

E.反馈

We know it is hard to make such a decision _______ he has just built up the team and the project is going through the important stage now. [ ]

A. that

B. as

C. when

D. before