Judging from the time information of "Kaiyuan Prosperity" and "Tianbao Queen" in the poems, combined with the contents of the poems, the poems reflect two completely different phenomena of prosperity and decline in the social development of the Tang Dynasty after "Kaiyuan Prosperity" and "An Shi Rebellion", and different poems describing the two different phenomena were written by the same poet, so the poet must have experienced the period from prosperity to decline in the Tang Dynasty. Judging from the four options provided by the topic, item A Chen Ziang lived in the early Tang Dynasty; Item B Meng Haoran lived in the prosperous Tang Dynasty; Du Fu in item C lived in the Tang Dynasty, which turned from prosperity to decline, and Du Mu in item D lived in the late Tang Dynasty. Therefore, none of the poets in A, B and D experienced a decline from prosperity in the Tang Dynasty, which can be ruled out, so Du Fu is the most likely one. I hope I can help you. Please click "Like" at the bottom of my answer. Thank you.