Answer:
A
Step-by-step explanation:
The passage explains the uses and characteristics of gargoyles in great detail and even goes as far as to describe the impression that the gargoyles give when they are perched on the edge of a cathedral.
The most useful tool to aid comprehension would, therefore, be a drawing of a gargoyle with labels that identify the parts of the gargoyle mentioned in the passage. The addition of this visual aid would help connect the very complete description in the paragraph with the actual object.