Final answer:
The stanza from "Dover Beach" best supports the inference of a) The decline of religious faith.
Step-by-step explanation:
The stanza from "Dover Beach" best supports the inference of a) The decline of religious faith. In the stanza, the narrator describes how the "Sea of Faith" used to be full and vibrant, but now he only hears its "melancholy, long, withdrawing roar." This suggests that religious faith was once strong, but has since declined or faded away.