A. that are implicated in global warming, comes both from
comes from both A and B or comes both from A and from B
The usage of 'from' before "...host of human resources..." seems to make A the answer, IMO.
B. that are implicated in global warming, coming from both
Same reason as stated in A.
C. being implicated in global warming, comes from both
being - temporary usage, doesn't fit the meaning?
D. implicated in global warming and coming both from
coming both from A and B, ____ (the remaining part is missing). Structure and meaning fails here?
E. implicated in global warming, that come both from
Changes the intended meaning --> global warming does not come from natural sources and human sources... greenhouse gases do.
IMO, Answer is A.
Experts/experienced folks please comment whether the other options are incorrect for reasons other than those stated above.