Quote:
B. From 2007 to 2014, Africa’s elephant population has declined by nearly a third, mostly due to poaching.
Nightmare007, the issue with "due to" is that it can only modify a noun, not a verb. In (B), the phrase "mostly due to poaching" is trying to modify "has declined" -- and that's a verb. So "due to" is wrong in this case. A full thread on "due to" can be found here: https://gmatclub.com/forum/due-to-vs-be
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