What are two important aspects of reading poetry aloud?
a. rhythm and tone
b. pitch and rhyme
c. rhythm and fluency
d. pitch and fluency

I'd say that two important aspects of reading poetry aloud are A. rhythm and tone.
First of all, you need to read the poem in the appropriate rhythm - not too slow, not to fast, you have to find a balance. When it comes to tone, it also has to be appropriate - if the poem is about death, for example, you shouldn't read it in a cheerful tone. 

The correct answer is b