Which of these lines from "the rime of the ancient mariner" contains internal rhyme?

You've cited no text here, so I'll simply use examples from the text, which include interal rhyme. In poetry, internal rhyme, or middle rhyme, is rhyme that occurs in a single line of verse.

"In mist or cloud, on mast or shroud" or "Whiles all the night through fog-smoke white,"

Example of how its works from part II

"The SUN..|..now ROSE..|..up ON..|..the RIGHT,

Out OF..|..the SEA..|..came HE,

Still HID..|..in MIST,..|..and ON..|..the LEFT

Went DOWN..|..in TO..|..the SEA.......