None of the typical physical properties, such as color, hardness, and melting point, of the element Astatine (At) is known because, due to its high radioactivity, it almost immediate decays into something else.
(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
The answer is very simple if we can apply usage of
due to--when the effect is a noun
because/because of-- when the effect is a verb
here effect is---it almost immediately decays into something else which is a 'verb', hence it is clear that we need to use 'because'. Now A, B & C are out due to obvious reasons of awkwardness, lengthy etc. Left are only D & E out of which 'because' is used in option D only. Hence our answer should be D.