I would say D. valid is the correct answer
One out of four types of character belongs to round character. It has characteristics that able the readers to get-to-know the character. They have the ability to change according to their motivation and inspiration to further understand the story.
An onomatopoeia refers to the property of such word that implies or describe the sound of an animal or natures noise. Base on that, the sample words in the seven ages of man that implies an onomatopoeia are the MEWLING and PUKING in the nurse's arm, WHINING school boy, SIGHING like furnace, WHISTLES in his sound. I hope this would help