Historian: The early Egyptian pharaohs spent as much wealth on largely ... ...

Historian: The early Egyptian pharaohs spent as much wealth on largely ceremonial and hugely impressive architecture as they did on roads and irrigation systems. This was not mere frivolousness, however, for if people under a pharaoh’s rule could be made to realize the extent of their ruler’s mastery of the physical world, their loyalty could be maintained without military coercion. The claim that early Egyptian expenditure on largely ceremonial architecture was not frivolous plays which one of the following roles in the historian’s argument?
(A) It is a conclusion purportedly justified by the argument’s appeal to the psychological effects of these structures on the Egyptian population.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in June 2013 LSAT (PT69): Logical Reasoning B