Re: By identifying stable isotopes of carbon-12 in human tissue

hi,

Diamond's point:- Europeans had more number & high technology due to corn and its usage.
on the other hand American societies had no time to create societies as large and complex as the Europeans as they did not cultivate more and as result they were defeated.

Author's argument:-this is not the reason.
they also had man power after they started cultivating grains.
the reason is 1)epidemic & 2) politics.

question :to weaken the author's argument.

IMO B which is the OA provides an alternative reason for defeat, I dont think so it can be the best choice.

while A & C could be potential answers, but C assumes to much, thus A can be a good answer.

kindly correct if wrong!
My Choice-A

thanks,
Aniket
Cheerz!