The answer is D. It is restarting the thesis.
I can't really tell you what it is, but I can give you the definition of each of those terms.
"Ode is a formal, often ceremonious lyric poem that addresses and often celebrates a person, place, thing, or idea. Its stanza forms vary. The Greek or Pindaric (Pindar, ca. 552–442 B.C.E."
"Sonnet is a fixed verse form of Italian origin consisting of 14 lines that are typically 5-foot iambics rhyming according to a prescribed scheme also : a poem in this pattern."
"A haiku is considered to be more than a type of poem; it is a way of looking at the physical world and seeing something deeper, like the very nature of existence. It should leave the reader with a strong feeling or impression."
"The sestina follows a strict pattern of the repetition of the initial six end-words of the first stanza through the remaining five six-line stanzas, culminating in a three-line envoi. The lines may be of any length, though in its initial incarnation, the sestina followed a syllabic restriction."
*Not my words!*
Hope this helps!
Answer: I think the answer is maintaining
Explanation: This seems past tense so he ing prefix ing seems right
