Which Fact Best Illustrates How Disruptive Email Can Be

Which fact best illustrates how disruptive email can be?

A) Almost two-thirds of executives say that they sent out more emails than ever during the past year.
B) Thirty-seven percent of employees say that they received more emails than ever during the past year from executives.
C) Almost half of wi-fi users claim to get antsy if they need to wait an hour before checking their email.
D) It takes 64 seconds for a person to regain his or her train of thought following an email interruption.