Test analysis: Liu Gongquan is a famous calligrapher in Tang Dynasty, who is good at regular script. So choose item C as seal script; Item b is to run the script; Item d is cursive.
Comments: Calligraphy is an integral part of China's traditional culture and a treasure in China's art palace. With the proper density of Chinese characters, writing has aesthetic feeling. During the Wei, Jin, Southern and Northern Dynasties, Wang Xizhi in the Eastern Jin Dynasty, Yan Zhenqing, Liu Gongquan, Zhang Xu and Huai Su in the Tang Dynasty all needed to master it.