Answer:
D. The stanzas are uneven and do not have clear endings.
Explanation:
The stanzas in the poem are groups of lines. They are one of the basic forms out of which the poems are build up. They can be rhythmic, but they are often uneven and each has its own length. They also can have various forms, depending on the poem.
They can be separated by the blank line, but it can vary from poem to poem. Stanza, on its own, doe not have a clear ending outside of the poem.
