Hey there!
I believe your answer would be either "This is the most beautiful painting I have ever seen," or "This is the most beutiful painting I have ever saw."
Hope this helps!
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Correct me if I’m wrong but I think it’s the first one
I think the answer is d.<span>the greenberg article shares research about marshall, while the informational text is based on an interview.</span>
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!