The excerpt that contains a strict internal rhyme scheme is:
B. But the raven, sitting lonely on the placid bust, spoke only (from "The Raven" by Edgar Allen Poe)
In this excerpt, you can see the internal rhyme scheme with the repeated sound of the vowel "o" in the words "lonely," "placid," and "only." This consistent rhyme pattern within the lines of the poem creates a sense of rhythm and cohesion, making it an example of a strict internal rhyme scheme.