Final answer:
The fourth major variety of Guzheng in Ancient China, alongside the Haozhong, Luqi, and Jiaowei, was the Taoyuan.
Step-by-step explanation:
The four major varieties of Guzheng in Ancient China were the Haozhong, Luqi, Jiaowei, and D) Taoyuan. This question taps into the rich tapestry of Chinese cultural heritage and history, reflecting the diversity and sophistication of ancient Chinese art forms. The Guzheng, a traditional Chinese musical instrument, was emblematic of the artistic and cultural flourishes that characterized different periods of Chinese history, much like the distinctive styles of porcelain and the evolution of court music and dance.