I think that the answer is probably B.
The answer to 1 is C) a system of roads and bridges
The answer to 2 is C) they built terraces in the mountains
The answer to 3 is A) corn
The answer to 4 is C) a calendar
The answer to 5 is C) building island gardens
Whoo, that's a lot of "C's!" Hope this helps! Please let me know if I got some wrong :)
Island Hopping
Island hopping or leap frogging was the military strategy used by the Allies in the Pacific War against Japan and by the Axis powers in WWII
Because of their knowledge of how to hide, and confuse other people when they are fighting in a jungle or something, the guerill force would have the element of suprise when fighting a larger force.
I believe it is C. Hope this helps and give me branliest or failure.