Final answer:
The term that best completes the sentence about Jesus' disciples is 'Church', as they formed communities for worship that developed into formal churches over time.
Step-by-step explanation:
The question asks which term best completes the sentence: 'Jesus' disciples make up a universal ______________________.' The correct answer is D) Church. This term is related to a group of believers who gather for worship and adhere to a set of religious beliefs and practices. The term ecclesia refers to a religious congregation that is widely recognized within a society and is often referred to as an official religion, which can be closely allied with governmental powers, as seen in some state religions. In the context of Christianity, Jesus' disciples and followers formed communities and met for worship in house churches, which later developed into formal structures known as churches.