Educator: Some experimental educational programs, based on the principle ... ...

Educator: Some experimental educational programs, based on the principle that children’s first education should take place at home, instruct parents in how to be their child’s “first teacher.” The school performance of the children in these programs is better than average. This shows that these programs are successful and should be expanded. Which one of the following, if true, most weakens the educator’s argument?
(A) Not all small children enjoy being taught by their parents.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2012 LSAT (PT67): Logical Reasoning A