A descriptive quote is simply a quote that throughly describes and gives details about a subject or in this case a character.
Without more information on your assignment, my best understanding is that your teacher is looking for a quote from whatever literary piece you are reading that best describes each of the characters.
Answer:
A sounds like it fits the best
I seek your wisdom, so I can walk in the path you lay before me, knowing right from wrong, protecting against temptation and deceit. Fill me with your knowledge, O Lord, so I may walk in the straight and narrow path, in faithfulness to follow you. In Jesus' name I pray, Amen.