Which of the Following Sentences Is Free of Opening Fillers

Which of the following sentences is free of opening fillers, redundancies, and excessive expressions?

A) There are several reasons that we should start using social media to communicate with customers.
B) Our company should start using social media to communicate with customers for several reasons.
C) Due to the fact that we need to improve communication with customers, our company should start using social media.
D) It is perfectly clear that our company should start using social media to communicate with customers.