The easiest way to separate B from A here is through the 'negation test' (an approach which you should take in evaluating answers on most NA questions). You simply 'negate' each answer by considering its inverse and whichever inverse renders the conclusion invalid or most severely harmed should be the argument's NA.
Here the negation test would turn A from "people who browse the web for medical information typically do so in an attempt to diagnose their medical conditions" to "people who browse the web for medical information typically DO NOT do so in an attempt to diagnose their medical conditions". This negated answer would not do much to our conclusion which concerns "doing more harm than good".
The inverse of B would, however. "People who attempt to diagnose their medical conditions likely WILL NOT do themselves more harm than good unless they rely exclusively on scientifically valid info." This significantly harms the conclusion indicating that it is the argument's necessary assumption.
Hope this helps.
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The easiest way to separate B from A here is through the 'negation test' (an approach which you should take in evaluating answers on most NA questions). You simply 'negate' each answer by considering its inverse and whichever inverse renders the conclusion invalid or most severely harmed should be the argument's NA.
Here the negation test would turn A from "people who browse the web for medical information typically do so in an attempt to diagnose their medical conditions" to "people who browse the web for medical information typically DO NOT do so in an attempt to diagnose their medical conditions". This negated answer would not do much to our conclusion which concerns "doing more harm than good".
The inverse of B would, however. "People who attempt to diagnose their medical conditions likely WILL NOT do themselves more harm than good unless they rely exclusively on scientifically valid info." This significantly harms the conclusion indicating that it is the argument's necessary assumption.
Hope this helps.