What is the rhyme scheme of this stanza?

Answer:
The correct answer is option b. abcb
Explanation:
The term rhyme scheme refers to the pattern of sounds that are repeated at the end of a line or stanza in a particular poem. This pattern is generally encoded by the letters of the alphabet, thus when in a particular poem any line or stanza is designated with the same letter, that means that such lines or stanzas rhyme with each other.
In the particular stanza, provided, the second and fourth lines, rhyme with each other, therefore, they correspond to "b".
Bearing in mind the described above, it could be said that the rhyme scheme of the poem is abcb.