(A) After crude oil, natural gas is the United States second biggest fuel source and supplied almost exclusively from reserves in North America.
(B) Natural gas, after crude oil the United States second biggest fuel source, supplied almost exclusively from reserves in North America.
(C) Being supplied almost exclusively from reserves in North America, natural gas, the United States second biggest fuel source after crude oil.
(D) Natural gas, the United States second biggest fuel source after crude oil, is supplied almost exclusively from reserves in North America.
(E) Natural gas is supplied almost exclusively from reserves in North America, being the United States second biggest fuel source after crude oil.
Solution:
Modifier + Redundancy
A can be eliminated due to use of and supplied rather than and is supplied.
B misses the much needed is at vital positions.
C and E use being unnecessarily.
D is the best choice.
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