Question

Why might Kafka have used the word Ungeziefer, which had anti-Semitic undertones, to describe Gregor's transformation?

Answer 1

D. Kafka was Jewish and wanted to make a political point about anti-Semitism. 
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Answer 2

Metamorphosis doesn't only explore the problems and concerns of modernity, but also casts light to the lives of assimilated Jews in Prague. Kafka's times were known for Jewish integration into European culture when it faced anti-Semitic attitudes and he was making a political stance and reference to Jewish identity in his writings. The correct answer is D.