Best answer: (B)
Identify the conclusion and the premise(s):
Premise: Commuter rail and rapid transit services are intended to provide for the general welfare of the population of a metropolitan area.
Conclusion: When a government takes steps to privatize part or all of a metropolitan rail service, it has shirked its responsibility to provide for the general welfare.
Explanations:
Identify question type and give some tips:
The underlying assumption is that governments alone are responsible for providing the general welfare by fully assuring commuter rail and rapid transit service; commuter rail and rapid transit cannot serve the public good outside the government.
Scan each answer choice by eliminating progressively each “wrong” answer to finish with the “best” answer:
(A) seems tempting but it is too broad and extreme, and does not refer to rail service specifically, so it does not have to be true. (C) is also too broad. (D) and (E) assume too much; we have not said that costs cannot be cut without providing for the general welfare. (B) is correct, albeit incomplete: of course we must assume the government is responsible for assuring repairs if we must assume they are responsible for the whole thing.