in a typical central plan church, where is the altar located?\na. the atrium\nb. the narthex\nc. the apse

Brief Explanations:

In a typical central - plan church, the altar is located in the apse. The apse is a semi - circular or polygonal recess at the end of the church, often the most sacred part where the altar is placed. The atrium is an entrance hall, and the narthex is an entrance area at the west end of the church, neither of which is where the altar is typically located.

Answer:

C. the apse