Researcher: Any country can determine which type of public school system will work best for it by investigating the public school systems of other countries. Nationwide tests could be given in each country and other countries could adopt the system of the country that has the best scores on these tests.
Which one of the following is an assumption required by the researcher’s argument?
(A) A type of school system that works well in one country will work well in any other country. - CORRECT. If not, then conclusion falls apart.
(B) A
number of children in each country in the research sample are
educated in private schools. - INCORRECT. Nothing as such is mentioned or suggested in the passage.
(C)
If two countries performed differently on these nationwide tests,
further testing could determine what features of the school systems account for the
differences. - INCORRECT. 'IF' is a red flag. We cannot articulate what may work and how from the passage. Also, 'differences', although may help in adopting another country's system indirectly, cannot directly be interpreted.
(D)
Most countries in the research sample already administer nationwide tests to their public school students. - INCORRECT. 'Most' is extreme to say.
(E) The nationwide testing in the research sample will target as closely as possible
grade levels that are comparable in the different countries in the research sample. - INCORRECT. A trap wherein one may assume that 'grade levels' are equivalent to 'scores'. We don't know anything of 'grade levels'.