Final answer:
The phrase 'The natural world is a source of wonder' best captures the two layers of meaning in Dillard's implication, intertwining human and non-human elements with chremamorphism and personification, as seen in the references.
Step-by-step explanation:
From the provided references, the phrase which Dillard implies has two layers of meaning, though not explicitly listed, seems to resonate closely with option C, 'The natural world is a source of wonder.' This phrase reflects the dual perspective of the natural world being both a source of beauty and a realm where the human and non-human elements intermingle and each is personified to some extent. The chremamorphism of depicting the speaker 'lonely as a cloud' and the personification found in the daffodils 'tossing their heads in sprightly dance' underscore the wonder present in these layers of existence; from the individual's connection to nature to the complex ecosystem that provides such wonder. Moreover, Huck's reverence of the morning scene and Wordsworth's yearning for a connection with the natural divinities further emphasize the multifaceted marvels of the natural world.