Cao Zhi lived in ( ). A: the prosperous era of Kaiyuan. B: the era of Wen and Jing C: Jian'an era

Among these five wood structure of the Tang Dynasty, the earliest one is____ A: Bell Tower of Kaiyuan Temple B: East Hall of Foguang Temple C: Nanchan Monastery D: Tiantai Monastery E: Wulong Taoist Temple