Why is B correct? Why is A incorrect?

@Ryan-Mahabir, (B) is supported by lines 23-25 "with most environmental...risks [voluntariness] is not all-or-nothing matter, but rather one of a degree. (A) is incorrect because even though the author agrees that the government should attempt to save as many lives as it can, subject to limited public and private resources, departures from this principle are justified based on the totality of factors that underline the notion of voluntariness.