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My answer is (B). It took me 01:50.

(A) It is rather hard to fully comprehend what this sentence means by "because daylight hours decrease along a similar westward pattern".
"at first" and "begin" are redundant.

(B) The sentence is concise and clear.
What is the antecedent for "that" in "that is the direction"? Probably "west".

(C) "and" should be deleted, for two reasons.
(1) "and" should be appropriately used to construct an coordination sentence: IC1 + Comma + FANBOYS + IC2. (IC stands for Independent Clause). Here, a subordination sentence is needed.
(2) How about deleting the first word "While"? The sentence structure would be correct (as a coordination sentence), but the transition from IC1 to IC2 calls for "but“ rather than "and".

(D) In this subordination sentence, the use of "because" fails to capture the relationship between subordinated clause and main clause.

(E) "they" should be deleted as the sentence already has its subject "Some bird species".
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(B) is correct IMO


Some bird species at first begin migrating from east to west because daylight hours decrease along a similar westward pattern, but they then turn south to head towards warmer weather.


A) Some bird species at first begin migrating from east to west because daylight hours decrease along a similar westward pattern, but

Eliminate A for following reasons
The sentence intends to present some fact about some bird species, so it is best to use present tense especially when we have present tense in non underlined portion.
At first and begin makes the sentence look redundant and superfluous

B)At first, some bird species migrate from east to west because that is the direction in which daylight hours decrease, but
Correct

C) While some bird species migrate east to west at first, the direction that daylight hours decrease, and
No main clause
Sentence is awkward and ungrammatical

D) Because some bird species migrate east to west since it is the direction that daylight hours decrease,

use of Because and since together is wrong - Eliminate

E) Some bird species, beginning by migrating from east to west because this is the direction that daylight hours decrease,
Present participle should modify the preceding clause, but the sentence is structured in such a way that there is no preceding clause.
Eliminate
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Some bird species at first begin migrating from east to west because daylight hours decrease along a similar westward pattern, but they then turn south to head towards warmer weather.


A) Some bird species at first begin migrating from east to west because daylight hours decrease along a similar westward pattern, but - Use of begin is wrong. Should be began

B) At first, some bird species migrate from east to west because that is the direction in which daylight hours decrease, but - Correct

C) While some bird species migrate east to west at first, the direction that daylight hours decrease, and - Incorrect contrast

D) Because some bird species migrate east to west since it is the direction that daylight hours decrease, - use of that is incorrect.

E) Some bird species, beginning by migrating from east to west because this is the direction that daylight hours decrease, - No verb for some bird species.
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Some bird species at first begin migrating from east to west because daylight hours decrease along a similar westward pattern, but they then turn south to head towards warmer weather.


A) Some bird species at first begin migrating from east to west because daylight hours decrease along a similar westward pattern, but Incorrect

misplaced at first, a similar westward pattern compare what? this choice wordy

B) At first, some bird species migrate from east to west because that is the direction in which daylight hours decrease, but Correct

that indicate east to west

C) While some bird species migrate east to west at first, the direction that daylight hours decrease, and Incorrect

while can be use as conjunction, no need additional 'and'

D) Because some bird species migrate east to west since it is the direction that daylight hours decrease, Incorrect

it refers to what
there is no cause and effect relationship in sentence

E) Some bird species, beginning by migrating from east to west because this is the direction that daylight hours decrease, Incorrect

Some bird species is a fragment
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