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Sajjad1994
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IMHO "...who opposed the swampland protection bill..." is an essential modifier.
For this reason answer D
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theirselves doesn't make sense - A is out
Those of the legislators is redundant - B is out
who opposed the swampland protection bill is an essential modifier - C is out
D looks perfect
whom is does not make sense - E is out.
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Correct answer is D because 'who...' is an essential modifier and doesn't require commas
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