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Option D coincides with the explanation that the drop in the performance was due to the shift to charter schools and most charter schools have opened only recently and they're at a disadvantage as regards the comparison study.
Researchers maintain that the lower average performance of charted schools can be attributed to their having changed schools to attend the charter school.
Argument above is clearly supported by :
Many charter schools are established to instruct the students who were performing poorly in school. ==> So those student who doesn't perform well are getting recruited (or changing their school to charter schools). and this change is resulting in lower average performance of the charter school. As mentioned by the researchers that change of school can be attributed as the reason for the lower performance of the charted school.
Hope it makes sense.
OA Plz?
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