Which quote from Lies' retelling of Orpheus and Eurydice shows Orpheus used his music to accomplish a goal?

a. " He knew what it was when he met the wood nymph Eurydice and for the first time felt the joy of love."
b. "At once, she was carried away to the Underworld, the dark region of the dead."
c. "Cerberus dropped his three heads low, ceased snarling for a moment and let him pass."
d. "Others maintain that Orpheus had reached the sunlight and turned to Eurydice, believing she was out, too"

c. "Cerberus dropped his three heads low, ceased snarling for a moment and let him pass."