Final answer:
The subject of this question is Social Studies. It is a high school level question about the belief of Simeon regarding Jesus being the promised Messiah.
Step-by-step explanation:
The subject of this question is Social Studies, which encompasses the study of human societies and their interactions. It includes various disciplines such as history, geography, economics, and political science.
Grade-wise, this question is appropriate for High School students who are studying social studies as part of their curriculum.
The correct answer is a. Believed. Simeon believed that Jesus was the Messiah that God the Father had promised. This belief is significant as it plays a crucial role in Christianity.