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Answers
A
B
C
D
E
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(A) known because, due to its high radioactivity, it almost immediately decays into something else
(B) known due to the fact that it decays almost immediately into something else because of its high radioactivity
(C) known if, because of its high radioactivity, it almost immediately decays into something else
(D) known: because of its high radioactivity, it almost immediately decays into something else
(E) known: due to its high radioactivity, it almost immediately decays into something else
OA D
Source: Magoosh













