According to the Text, Why Are More Businesses Shifting Away

According to the text, why are more businesses shifting away from paper forms of communication, such as memos and letters, to e-mail and text messaging?

A) The advances in information technology allow businesses to speed up the flow of communication.
B) Businesses like their employees to be available after work hours.
C) Memos and letters are no longer preferred because they leave a permanent record.
D) Customers expect businesses to communicate using the technologies they prefer.