A random survey of 1,000 people, all of whom moved over 2,000 miles away from a close friend over five years ago, found that in almost every case, those people who talked to their friend on the phone at least once a month were more likely to feel close to their friend five years later than were those who communicated only by electronic mail. Thus, a reliance on electronic mail as the primary means of communication can jeopardize a close long-distance friendship.
Which of the following, if true, most seriously weakens the argument above?
A. Long-distance friends who speak on the phone monthly also tend to communicate via electronic mail.
B. The communication patterns of friendships increase around holidays and birthdays.
C. The individuals who only communicate with their long-distance friends via electronic mail tend to have closer relationships with their nearby friends (those living in the same town, village, or city) than do the individuals who speak with their long-distance friends monthly.
D. According to another study, most people can easily control the amount of time they spend on the phone with long-distance friends.
E. People in long-distance friendships sometimes grow apart because of diverging lifestyles, and so they stop making the effort to speak with their friend on the phone.