Within a cross-functional team environment, employees are exposed to a variety of perspectives; to see the concerns of other departments is starting to realize the importance of the entire company working together to achieve its goals.

A) .....

B) perspectives; to see the concerns of other departments is realizing the importance of the entire company working together to achieve its goals.

C) Perspectives; seeing the concerns of other departments is to start to realize the importance of the entire company working together to achieve its goals.

D) Perspectives; to see the concerns of other departments is to start realizing the importance of the entire company working together to achieve its goals.

E) Perspectives; seeing the concerns of other departments is to realize the importance of the entire company working together to achieve its goals.


[spoiler]OA D. OE says "because rules of parallel structures dictate that "to see" must be paired with "to start" ."
Why "to see" must be parallel to "to start" and not parallel to "to realize" for instance ? we have three verbs, but OE says only two verbs need to be parallel ????[/spoiler]