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It has been hypothesized that our solar system was formed from a cloud ... ...

It has been hypothesized that our solar system was formed from a cloud of gas and dust produced by a supernova—an especially powerful explosion of a star. Supernovas produce the isotope iron-60, so if this hypothesis were correct, then iron-60 would have been present in the early history of the solar system. But researchers have found no iron-60 in meteorites that formed early in the solar system’s history, thereby disproving the hypothesis.

Which one of the following is an assumption required by the argument?

(A) If a meteorite is formed early in the solar system’s history, it contains chemical elements that are unlikely to be found in gas and dust produced by a supernova.
(B) ...
(C) ...
(D) ...
(E) ...

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

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