The themes that can be supported by details in the text are:
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Everyone eventually grows old and frail - This theme is illustrated by the description of the old man's physical decline and how he is treated by his family.
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A little kindness goes a long way - This theme is reflected in the transformation of the family’s attitude toward the grandfather after they see the child's innocent act of gathering wood for a trough, leading to them allowing him to eat at the table again.
Thus, the best answer is A and C.