Evidence - The parents who made their children, when they were between the ages of 2 and 10, watch videos of Pete Sampras, had children who grew up to be much better tennis players than children of parents who did not do so.
Conclusion - The parents who wish to make their children pursue tennis should make their children, when they are between the ages of 2 and 10, watch videos of legendary tennis players.
Prethink - What could be the reason for such children to be better tennis players than others just by watching videos? Maybe they learn or adapt something from the video .
(A) Pete Sampras was one of the greatest tennis players of all times and even modern tennis greats try to emulate him by watching his videos.
The greatness of Sampras does not explain the reason why the children turn to be a better player. Emulating his game can't explain the success of it.(B) When children, who are between 2 and 10 years of age, watch Pete Sampras play, the neurons in their brains make subconscious connections as a result of which these children are able to apply some of Pete Sampras’ playing style
in their own game of tennis at a later stage in life.
Looks correct. The children inherits Sampras style in their own game. (C) Children whose parents made them watch videos of Pete Sampras when these children were
more than 10 years of age also saw a marked improvement in their children’s ability to play tennis.
The children aged above 10 are not in the context of the argument.(D) Parents who made their children, when they were between 2 and 10 years of age, watch videos of
other legendary tennis players also reported that their children developed into excellent tennis players.
Although videos other legendary tennis players too might help the children, but does not help in explaining the reasoning. (E) Some children whose parents did not expose them to videos of any tennis players also developed into excellent tennis players later in life.
This denigrate the importance of the Sampras' video and is weakening the argument.IMO
B