We can deduce that the detail from the text that best supports the answer to Part A is:
A. “A marriage certificate, a will, and two portraits are about all that remains. Even his exact birthday is unknown, though it is generally observed on April 23.” ( Paragraph 2).
Detail actually refers to more information or facts that are introduced to clarify and validate a point. Details help to give more information.
Thus, we can see that the correct detail above gives the best supports the answer to Part A.
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