Final answer:
The sentence that will be parsed by the CFG is 'A cat walks' where 'cat' is the noun and 'walks' is the verb.
Step-by-step explanation:
The sentence that will be parsed by the given CFG is option C: A cat walks.
The subject of the sentence is 'A cat', where 'cat' is the NOUN. 'A' is an adjective modifying the noun 'cat', and 'walks' is the verb. There are no adverbs in this sentence.
The CFG specifies that the sentence should start with a noun and be followed by a verb, and option C is the only sentence that follows this structure.