Which of the following is the best evaluation of the artwork based on the criterion that the piece feature imaginary creatures or things?
a.) the artwork is successful because it features a fully clothed raven-headed winged creature.
b.) the artwork is successful because it features a pretend landscape
c.) the artwork is unsuccessful because a human form with wings is believable.
d.) the artwork is unsuccessful because it is very realistic

i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

let me know if this !

your answer would be d.)