20. Most discussions of the factors contributing to improvements in public health greatly underestimate the influence of the values held by individuals. This influence is indicated by the fact that the astonishing decline in mortality from infectious disease during the past century was primarily due to an improvement in living conditions. To a substantial degree, these improvements depended on the emphasis by and increasing share of the population on cleanliness, prudence, and moderation.
The main point of the passage is made primarily by
(A) analyzing existing data on medical practices and health outcomes
(B) presenting a set of related cause-and â€“effect assertions
(C) applying several general principles to a specific case
(D) presenting a general observation and supporting it with several specific examples
(E) refuting in detail a commonly accepted argument
I think it is C.
C and E are close.
A, B and D is totoally off topic.
The reason it is not E is that, we are not sure whether it is a commonly accepted argment. Although it has been mentioned that Most discussions of the factors contributing to improvements in public health greatly underestimate the influence of the values held by individuals
, it is not clear from here whether most discussion means commonly accepted.
Another problem with E is that, it refutes but not in a great detail. so E can't be the answer.
only C remains.