PT 49 S3 Q13

Through the last half century, the techniques used by certain historians of African art for judging the precise tribal origins of African sculptures...

Which one of the following most accurately expresses what the author means by "centers of style" (line 20)?
(A) geographical areas in which masks and similar sculptures are for the most part interchangeable among a number of closely connected tribes who use them
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: Art & Literature Mix 1