A is out, because of subject-verb agreement.
B Less cannot be used in this sentence as fibers are countable
C is Correct - The adverbial conjunction because accurately captures the causal relationship expressed by the sentence. The singular subject cut agrees with the singular verbs severs and is, and fewer appropriately modifies countable fibers.
D is also out as 'B'.
E Subject-verb agreement - plural verb sever with subject cut
B Less cannot be used in this sentence as fibers are countable
C is Correct - The adverbial conjunction because accurately captures the causal relationship expressed by the sentence. The singular subject cut agrees with the singular verbs severs and is, and fewer appropriately modifies countable fibers.
D is also out as 'B'.
E Subject-verb agreement - plural verb sever with subject cut

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