PT 65 S4 Q7

The ruins of the prehistoric Bolivian city of Tiwanakufeature green andacite ... ...

Which one of the following would be most useful to know in order to evaluate the support for the archaeologists’ hypothesis?
(A) whether the traditional techniques for building reed boats were in use at the time Tiwanaku was inhabited
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Dec 2011 LSAT (PT 65): Logical Reasoning B