Final answer:
Without the specific context from the original source material, it is not possible to definitively determine which statement about Emily and Navin's late maternal grandfather, and the past keeper of Emily's stone, is accurate.
Step-by-step explanation:
The question centers around the characters Emily and Navin from a specific literary context, likely relating to the fantasy or fiction genre. It asks which statement accurately completes the information about their late maternal grandfather, who was also the previous keeper of Emily's stone. Considering that none of the provided context directly references these characters and their grandfather, it isn't possible to determine the correct answer to this question definitively. An understanding of Emily and Navin's storyline, their family dynamics, and the significance of Emily's stone from the original source material would be necessary to complete the statement accurately.
However, if the story indeed emphasized familial bonds, the legacy left by ancestors, and the cultural importance within the narrative— themes commonly found in stories involving mystical heirlooms and family history—the most comprehensive option could be D) All of the above. This would imply that the grandfather had a deep connection with the family, played a significant role in family traditions, and left a lasting legacy in the family, all of which are typical outcomes of being a keeper of a significant family artifact. Without access to the specific text in question, we can only hypothesize based on common literary themes associated with such narratives.