Read the following example. What is the effect of the repetition in these lines? And the silken sad uncertain rustling of each purple curtain
Thrilled me filled me with fantastic terrors never felt before; So that now, to still the beating of my heart, I stood repeating
"Tis some visitor entreating entrance at my chamber door -
Some late visitor entreating entrance at my chamber door; –
This it is, and nothing more.

A)It emphasizes the speaker's friendliness.

B) It establishes the poem's tone.

C) It defines an unknown idea.

D) It introduces a new character.