The answer is C because, without any of the three options the message behind the speech will easily be ignored. The reaction the speaker wishes to invoke will go unnoticed if their appearance doesn't match their sophistication. The speech will be considered a simple letter or message if there isn't any emotion nor encouraging words. The audience will no longer contribute or care for the speech with the lack of these options, all are required.
I’m sorry I wasn’t able to finish them all, but I tried my best and hope that would help:)
A. Stream -> Tributary -> River -> Lake
The first one is wrong because they were still in disarray and revolution at the time being. They couldn't quite do this at the time due to those two problems.
The fact that the Mayans were building great buildings in their period of existence, is a proof that they had a very big political power in the region, and not just political, but also military, economic, cultural power.
Only civilizations that are strong, well organized, and political powerhouses, have been able to build such big structures, because they had the conditions and time for it. For building such big structures, lot of wealth is needed, also lot of workers, and great engineers. The Mayans had it all. They had great engineers, the labor force was provided in general by the slaves, or by the the tribes that they were ruling over, and from all the tributes paid to them by the people they ruled over, they had surplus of wealth, which meant that they can perform such activities without damaging the empire.