Final answer:
c. Stained-glass windows were used in Gothic cathedrals to enhance the religious experience of the worshipper by depicting religious stories and subjects. They served as instructional tools in theology and symbolized the presence of God.
Step-by-step explanation:
The type of window used in Gothic cathedrals to enhance the religious experience of the worshipper is c. stained-glass windows.
Gothic churches had vast expanses of windows that were filled with exquisite, large stained-glass windows depicting religious stories and subjects. Stained glass windows were a form of visual media that served as instructional tools in theology and the metaphorical presence of God.