I think it's a pun (basically a joke that is related to a specific word, like its meaning or sound) - because it's wordplay about light vs heavy
A is the answer. B has a 'plural verb' and a singular subject, as does C. D has a plural subject and 'singular verb'
The answer is:
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"To hunt in the park is a serious offense."
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Note: The 'infinitive phrase that functions as the subject is: 'To hunt' .
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Kafka uses the definite article "the" because it was not a simple metamorphosis. It was a specific changed that happened to the main character. Although it was not possible to happen in the real world, transforming into a giant moth represents the ultimate change that can happen to anyone.
