The correct answer is A. Religious systems that included sacrifice rituals.
Explanation:
Ancient civilizations shared many common features including social stratification or the creation of artistic and architectural elements. However, sacrifice ritual was not a common feature civilizations such as Mesopotamia, Mesoamerica, etc. shared. Indeed, sacrifice rituals including human sacrifice rituals existed in cultures such as the Aztecs in Mesoamerica but this was not a generalized practice or a basic element found in the first human civilizations. Moreover, this practice was linked to specific religious beliefs. According to this, the correct answer is A.
