Here is the answer. Based on the given sentence above, the correct possessive noun would be "cat's" apostrophe s if the noun is singular, and "cats'", apostrophe only, if the noun is plural. Hope this answers your question. Have a great day ahead!
D. To build ethos
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No,It may be helpful but most time you won't understand what you read. It's better to slowly read and understand you're passage.
A because it gets updated whenever there is new info