Abhi077
Like the large tracts of unbroken forest that the Pileated woodpecker requires to both feed and nest year-round as a non-migrating species, the woodpeckers disappearing in the eastern United States is a consequence of suburban commercial developments and of the introduction of invasive species.
Abhi077
A. the woodpeckers disappearing in the eastern United States is a consequence of suburban commercial developments and of the introduction of
looks good. Note that the use of like indicates that you need to compare two different nouns. In this case, large tracts and woodpeckers are compared
Abhi077
B. the bird itself is disappearing in the eastern United States as a consequence of suburban commercial developments and of the introduction of
Wrong use of as 'is' is a better choice (as noted in b). In addition,
the bird itself is redundant.
Abhi077
C. that the birds themselves are disappearing in the eastern United States is due to suburban commercial developments and the introduction of
Not comparing a noun to a noun Wrong use of 'that'
Abhi077
D. in the eastern United States, woodpeckers' disappearing due to suburban commercial developments and to the introduction of
This is not a complete sentence. Also, there is no comparison.
Abhi077
E. in the eastern United States, the woodpeckers' disappearing, a consequence of suburban commercial developments and introducing of
Same reasoning as D