© Because uranium is the heaviest, and, therefore the most penetrating, of natural metals, it is being increasingly used
(E) Because uranium is the heaviest, therefore the most penetrating of natural metals, it is being increasingly used
Uranaium is used in the production of armor piercing bullets... because it is heaviest and, therefre the most penetrating of natural metals.
C.
E, just makes penetration abilities of uranium a modifier.