Critical Reasoning

Guys ,

Pls help me out with the below problem.


Child development specialists have observed that adolescents who receive large weekly allowances tend to spend money on items considered frivolous by their parents whereas adolescents who receive small weekly allowances do not. Thus, in order to ensure that their children do not spend money on frivolous items, parents should not give their children large weekly allowances.

Which of the following pieces of information would be most useful in evaluating the validity of the conclusion above?

A)The average amount of money received by adolescents who receive large weekly allowances
B)Any differences among parents in the standard used to judge an item as frivolous
C)The educational background of the child development specialists who made this observation
D)The difference between the average annual income of families in which the parents give their children large weekly allowances and that of families in which the parents give their children small weekly allowances
E)The percentage of adolescents who receive no weekly allowance

The answer is B.

What we need to know is if the parents are using the same standard for what is frivolous. If they are using the same standard than this seems like a pretty good argument. However, if they are not using the same standard then the difference may not be in what the children spend the money on, but rather in how the parents view the purchases.

The other 4 answers do not appear to have a bearing on this argument.