The correct response is:
by emphasizing the growing unease among the congregation at Mr. Hooper's appearance and the message of his sermon.
In the passage, the author illustrates how Mr. Hooper's appearance and the black veil create a sense of unease among his congregation. This unease reflects the underlying themes of hidden sin and guilt, as the veil serves as a symbol of the secrets and moral failings that the congregation may harbor, making them uncomfortable in the presence of their pastor. The congregation's reaction to the veil and Hooper's solemn demeanor further emphasizes their own hidden feelings of guilt and the disquieting nature of confronting such introspection.