30) B

A – Wrong
The text says that “candidates with lower qualifications would have to be recruited” suggests that those with lower qualifications are not ideal candidates and that they would not ve good teachers. So A is an assumption that the text makes. 

B – Correct
The text states that the idea of reducing the sizes of classes is not justified for other reasons. (little improvement in children’s education. The expense is just an additional reason why reducing class sizes is not justified. 

C – Wrong
This is assumed in the sentence “California had only risen to 48th”

D – Wrong
This is assumed in the sentence “children who do well at school are those that recruit their teachers from the brightest graduates”.

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