Just want to make sure my reasoning for chucking answer choice C is right:
The conclusion is "It makes sense to be skeptical of these sources (the anonymous sources in news stories)" and thereby restricts itself to a concern with only being skeptical of anonymous sources in news stories and does not concern itself with "all situations of a given type" (it doesn't make a sweeping generalization like 'whenever you ever encounter anonymous sources, it's right to be skeptical').
Also, the second part of answer choice C states "...on the grounds that this attitude is justified in a hypothetical situation of that type" - but the author never justifiesthat attitude in the hypothetical of the unsigned letter in sentance 1...he merely says that one would be" likely to have doubts about the truth of its contents".
Are both of these reasons for discounting C fair?
thanks!