Really good question. Got me thinking but finally got it right aft 2:32 s

Here was my approach:
Conclusion: Implicitly, we have always been willing
to trade off quantity of human life for quality.
Pre-thinking: From the premises and esp conclusion, we get to know that the assumption should not be too specific to any of the premises but has to be somewhat braod covering the argument. Also from the premises and conclusion, we come to know that the argument is mainly talking about the quantity(abortions, no. of traffic fatalities,war) and quality (
sanctity of life that are even more embarrassing to abortion opponents; federal legislation mandating a nationwide 25-mile-per-hour speed limit on all roads). Moreover, the focus of the conclusion is about quantity and quality of human life.
By POE, we see that options A,C & E are too specific and do not make sense looking at the conclusion. Finally on negating D & E as below:
D. The protection of human life is a justifiable goal of society
--> Doesn't affect the conclusion at all.B. An appropriate societal decision
is not made in the balancing of individual lives and the quality of life. --->
If this is true then the conclusion will fall part. In the sense there will be trade off in terms of quantity and quality of human life, affecting arguments concerning war , traffic fatalities and abortion opponents and sanctity of human life.What's the source?