What is the definition of a "theologian"?

A theologian is defined as a person who studies religion, particularly in relation to the nature of the divine, religious beliefs, practices, and the study of sacred texts. This discipline involves analyzing various religious traditions, doctrines, and the philosophical implications of faith. The focus is on understanding religious phenomena, ethical implications, and the historical context of belief systems. This is why the answer is C, as it accurately captures the essence of what a theologian does and the subject matter they engage with. Each of the other choices pertains to entirely different fields of study—economics, biology, and geography—none of which relate to the study of religion.