天山的一道题

天山03-38:
The normative model of strategic decision-making suggests that executives examine a
firm’s external environment and internal conditions, and in using the set of objective
criteria they derive from these analyses, can decide on a strategy.

A. conditions, and in using the set of objective criteria they derive from these analyses, can decide
B. conditions, and they use the set of objective criteria derived from these analyses in deciding
C. conditions and, in using the set of objective criteria derived from these analyses, deciding
D. conditions and, using the set of objective criteria derived from these analyses, decide
E. conditions and, in their use of the set of objective criteria they derive from these analyses, they decide

请问　　Ａ和Ｄ　的区别是什么　　

答案选　Ｄ　　但是Ａ　也好像未错　　examine...and can decide  对称？

A. ,and in using 注意 and 前面的逗号，这种情况下and 后面是完整句子，A.后面缺少主语

D. and 后面是逗号，说明 and 连接 examine,decide，都是that从句中的动词，句子结构完整。