Answer:
B. It has been my experience.
Explanation: When a problem presents itself, keep working at.
Sports and games offer students a lot of lessons and values. Other than the fact that sports is good for the health of a student, it also teaches students patience, sportsmanship, and appreciation of hard work. Patience because in order to win games, one has to maintain level headed and cool so that he will not cloud his judgment. Sportsmanship, so that even if one loses, he is not bitter about it and can even congratulate his opponent. And appreciation for hard work because attaining skills is not an easy task.
I would have to say that the best way to revise sentence four is by changing "aren't" and "they're" to "are not" and "they are."
"Argue" works better than "fight."
Deleting the entire sentence would remove the transition into cost efficiency of the tablets.
And moving the sentence to the end would place the transition to cost efficiency in the wrong place.