Question

What determines the pattern of a rhyme scheme in poetry ?

A. Stressed and unstressed syllables

B. Assonance and alliteration

C. Whether a poem is spoken or read

D. The last word in each line

Answer 1

I think the answer is A.

Answer 2

The answer is D. The last word in each line. 

Example:  
Roses are red
violets are blue
sugar is sweet
so are you

thee rhyme scheme is ABCB because the last word in the second and fourth line rhyme, but the last words in the first and third do not.