The correct answer for the question that is being presented above is this one: c. desks arranged in rows in a classroom. From the definition of configuration that means the way the parts of a certain object are arranged. Choice letter C is so obvious because it talks about arranging the desks in a classroom.
Here are the following choices:
a. the effects of frequent exercise
b. leaves that have fallen from a tree
c. desks arranged in rows in a classroom
d. the grades of a student who studies well