Final answer:
Option C, that literature draws its essence from gritty realities and human experiences, best aligns with Margaret Atwood's metaphor describing literature's roots in the mud and its emergence into flowering through the raw materials of life.
Step-by-step explanation:
Margaret Atwood's metaphor emphasizes that literature is deeply rooted in the complexities and gritty experiences of life. She suggests that the origins of literary works are not pristine or detached from reality. Instead, they grow and are nourished by the raw and unfiltered experiences of the human condition. Therefore, literature blossoms from the interaction with, and interpretation of, real-world elements and human actions. This idea echoes the thoughts shared by literary critics and authors like Moore, who recognized the authenticity in artistic practice. The closest answer aligning with Atwood's comparison of literature to mud and flowers is that literature draws its essence from the gritty realities of life and human experiences, which corresponds to option C.