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Astrophysicist: Gamma ray bursts (GRBs)—explosions of powerful radiation ... ...

Astrophysicist: Gamma ray bursts (GRBs)—explosions of powerful radiation from deep space—have traditionally been classified as either “short” or “long,” terms that reflect the explosion’s relative duration. However, an unusual GRB has been sighted. Its duration was long, but in every other respect it had the properties of a short GRB. Clearly, the descriptive labels “short” and “long” have now outlived their usefulness.

The conclusion of the astrophysicist’s argument is most strongly supported if which one of the following is assumed?

(A) No other GRBs with unusual properties have been sighted.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT72 (Jun 2014): Logical Reasoning B

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