C. They are rhyming couplets
D. They are in iambic pentameter.
These are the only two options that are correct. The lines are written in rhyming couplets since the words "be" and "she" rhyme as well as "so" and "know". Each line has 10 syllables and is written in iambic pentameter. Because of these specific structural elements, the lines are not written in prose or in blank verse.