Code of Hammurabi: The Code of Hammurabi is thought to have been very influential on the Ten Commandments. Hammurabi was the Babylonian King that endorsed the code. It dates back to around the 1770s B.C.E. It is one of the earliest Babylonian pieces of writing that we have today, and in it is an early appeal to the idea of presuming innocence in court, which is still commonplace in American courts today.
Daoism: Daoism, an ancient belief system is responsible for the yin-yang symbol. Yin and yang are opposites, such as light and dark: together they make up a whole, and it is always necessary for one to have the other.
Edict of Milan: Constantine, emperor of Rome legalized Christianity with the Edict of Milan in 313 C.E. The Edict of Milan was not entirely concerned with Christianity: it made it legal to practice any religion one chose.
Jewish diaspora: During the Jewish diaspora, when the Hebrew kingdoms were conquered by the Assyrians, the Persians, and the Romans and displaced from their homelands, they managed to maintain their own, unique identity by formalizing their religion, codifying their scriptures, and adhering to their monotheistic God. During the main part of the Jewish diaspora, they were divided into three groups: one in Egypt, one in Babylon, and one in Jude. In 6 C.E. they became a Roman province. However, by in 70 C.E. there was a Jewish-Roman war, in which Jerusalem was destroyed.
Jesus of Nazareth: Jesus of Nazareth, the founder of Christianity, often questioned Jewish tradition and claimed to be the Jewish messiah. According to the four gospels of the Christian scriptures, this angered the Jewish conservatives. They complained to the Roman procurator, Pontius Pilate, who sentenced him to death.
Similarity between Confucianism and Daoism: Both Confucianism and Daoism formed in China in around the 500s B.C.E. The similarity between these two belief systems both allowed for the Chinese tradition of ancestor veneration. The Confucius idea of filial piety and the Daoist conception of yin and yang both complement ancestor worship.
Vedism: Hinduism came out of, and included many parts of another belief system called Vedism. Buddhism came after Hinduism, and the other three religions listed began in China, not India, so the answer must be Vedism.