When the poet establishes a pattern of rhyme, usually marked by letters to symbolize correspondences, the reader can identify A. internal rhyme. B. rhyme scheme

Answer:

B: rhyme scheme

Explanation:

 A rhyme scheme is a regular pattern of rhyme at the end of the line of a poem. This pattern is demonstrated by the use of letters (beginning with "A") indicating the lines in a poem that rhyme with each other. For example:

[...] have you any wool ?  A

[...] three bags full !  A

[...] one for the dame B

[...] down the lane.  B