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Which of the following must be true?
A. The students of × High School watched television and listened to music for the same percentage of leisure time in 1990 that they spent using computers in 2000.
B. The students of × High School spent twice as much of their leisure time on the computer in 2000 as they did with friends.
C. In 1990, if students spent an average of six hours each week with friends, then they spent an average of 18 hours each week entertaining themselves with television, computers, and music.