Historian: Some critics argue that the decline of the ancient city of Veridia was caused solely by prolonged drought. However, archaeological records demonstrate that trade networks collapsed decades before the drought began, and civic infrastructure had already fallen into severe disrepair due to internal political strife. Thus, prolonged drought cannot be considered the sole cause of Veridia's collapse.
Based on the historian's argument, what is the author's main conclusion regarding the collapse of Veridia?
Answer: Prolonged drought cannot be considered the sole cause of Veridia's collapse. / Prolonged drought was not the sole cause of Veridia's collapse. / Prolonged drought was not the only cause of Veridia's collapse. / Drought was not the sole cause of Veridia's collapse. / Drought was not the only cause of Veridia's collapse. / Prolonged drought is not the sole cause of the collapse of Veridia.