Answer:
The correct answer is D. A metaphor for God.
Step-by-step explanation:
The phrase "Author of the Universe" is a clear metaphor that refers to God, understanding the supreme divinity as the creator of the universe as we know it. Thus, this phrase refers to the religious mythology that states that God (in any of his various names) created the Universe by his own means, through his divine power.
Thus, God is understood as the supreme creator divinity of man, nature and, ultimately, the entire environment known to humans.