
In this question, how is it determined that A was the correct answer over C? In the introductory paragraph it says "Research has also found that, on average, assimilation is associated with worse health." And the question stem says "Based on other results reported in the passage." Wouldn't these other results (ie research previously conducted) show that assimilation is associated with worse health, therefore Mexican immigrants are more assimilated?
I also thought that A was a plausible answer, based on the 4th paragraphs little blurb on SES, but the wording said it was only "partially" explained by SES. The explanation tells me why A is right, which I already could reason before seeing the answers, but not why C would be incorrect. How would you be able to distinguish this correct answer on the real test?