Question

Which definition below describes the definition of the theme of poetry
A) The pattern of ryming lines within a poem
B)The underlying message that a poem conveys
C) The pattern of stressed syllables in a poem
D) The type of poem :Haiku, limerick, free verse, ect.

Answer 1

D) The type of poem :Haiku, limerick, free verse, ect.

Answer 2

The theme of poetry is what happens in a poem, or B. the underlying message that a poem conveys. 
A and C refer to rhymes and meters, which have nothing to do with the theme.
D refers to genres, not themes.