Critical Reasoning

A scholar discovered an unlabeled 19th century recording of somone reciting a poem, written by Walt Whitman. During the 19th century, recordings of poetry were not made for wide commerical sale. Rather, they were made either as rare private souvenirs of the voices of famous poets or else as publicity stunts, in which actors recorded poems that were familiar to the public. Since the whitman poem in the recording was never even published, it is likely that the voice in the recording is actually whitman's.

The argument proceeds by...

A. offering several pieces of evidence each of which independently points to the same conclusion
B. distinguising a phenomenon into two subtypes and then for a particular case eliminating one of those subtypes.
C. offering a gnereal principle and then demonstrating that the general principle is violated in a particular.
D. showing that two apparently mutually exclusive alternatives are actually compatible with one another.
E. explaining the historical context of an incident in order to demonstrate that each of the two possible scenarios involving that incident is as likely as the other.




































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[spoiler]O.A: B[/spoiler]

Can anyone explain how do I attack this problem? What this question ask for without looking at the answers?
Thanks,