Like the grassy fields and old pastures that the upland sandpiper needs for feeding and nesting when it returns in May after wintering in the Argentine Pampas,
the sandpipers vanishing in the northeastern United States is a result of residential and industrial development and of changes in farming practices.
This question is a comparision question, but it is deep comparision question. We need to understand that there is nothing noun equivalent of "grassy field". For example there is nothing in the sentence that is of the structure- "Like grassy fields, Sugarcane fields themselves are doing X" i.e. there is nothing similar to "fields" in meaning terms.
(A) the sandpipers vanishing in the northeastern United States is a result of residential and industrial development and of changes in
--How are "grassy fields" common to "sandpiper"?
Kindly note when we use this structure- "Like X, Y". We generally have some characteristics that is common between X and Y.
Example:
Like USA, China is a large country. (both the countries are large)
Like Soccer, Rugby is a intense sport. (both sports are intense)
Are "grassy fields" a result of industrial and residential development? or Are they a result of changes in farming practices? No they are not.
Also, logically can sandpiper (a bird) be a result of industrial and residential development? can sandpiper be a result of chanes in farming practices? No they can not be. The fact they are vanishing is a result of industrial development.
Eliminate option A.
(B) the bird itself is vanishing in the northeastern United States as a result of residential and industrial development and of changes in
--This is correct. The sentence says- "the bird (sandpiper) itself is vanishing. This vanishing is a result of residential/industrial development". This logic is sound and seems correct.
But, how is "the bird" (sandpiper) similar to "grassy field"? Let's look at the shorter version of the sentence- "like grassy field, bird itself is vanishing because of industrial and residential development". (it implies that both are vanishing because of industrial/residential development).
This shorter version is similar to below mentioned structure.
Like USA, China is a large country. (both the countries are large).
(C) that the birds themselves are vanishing in the northeastern United States is due to residential and industrial development and changes to
--There is no noun here. What is "grassy field" similar to? a clause? not possible. Eliminate option C.
(D) in the northeastern United States, sandpipers' vanishing due to residential and industrial development and to changes in
--There is no verb here here. "Vanishing due to X" is not a clause. "is" is required to make it a clause ("Vanishing is due to X"). Eliminate option D.
(E) in the northeastern United States, the sandpipers' vanishing, a result of residential and industrial development and changing
--There is no verb for the subject -"the sandpipers' vanishing". Eliminate option E.