Final answer:
The key outcome of the Sui Dynasty's unification of China was the spread of Buddhist beliefs throughout the country. The Sui Dynasty's impact was significant in consolidating China but did not lead to further disunion or successful military conquests in Korea.
Step-by-step explanation:
The reunification of China under Emperor Wen of the Sui Dynasty had several significant outcomes. A key result was the spreading of Buddhist beliefs throughout China. Buddhism was supported by the state and grew in popularity as the Sui sought ways to consolidate and legitimize their authority. This religious spread was furthered during the subsequent Tang Dynasty. While there were attempts to conquer Korea, these were not successful and culminated in heavy losses for the Sui, contributing to the dynasty's downfall.Contrary to leading China into further disunion or conquering Korea with a massive army, the main answer to the question is that the establishment of the Sui Dynasty facilitated the spread of Buddhist beliefs across China. The Sui Dynasty, although powerful in its establishment of a unified state, did not rule China for centuries, as it was replaced by the Tang Dynasty after just a few decades, specifically because of military overextension and public dissatisfaction with the government's massive public works projects and military campaigns.As a result, the proper option is that Buddhist beliefs spread throughout China, which is reflected in the broad adoption of Buddhism and its influence on Chinese culture and society during and after the Sui regime.