Question

which characteristic is shared by sonnets and haiku
A. Similar focus on emotions
B. Structured rhyme scheme
C. Same total number of syllables
D. Set number of syllables per line

Answer 1

D. Set number of syllables per line. 

Haikus have the 5, 7, 5 syllable pattern and sonnets have 10 syllables per line.

Answer 2

D. set number of syllables per line

Is indeed correct.