I'm pretty sure that it's explain.
Hello there!
The correct answer is A:
State governments tend to be more responsive to social movements than the federal government because they are able to test out new programs on a smaller scale.
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The Law of Cosines is used to find the remaining parts of an oblique (non-right) triangle when either the lengths of two sides and the measure of the included angle is known (SAS) or the lengths of the three sides (SSS) are known. The Law of Cosines states: ... c2=a2+b2−2ab cosC .
Having a surplus of grain means they had more time for leisure activities which would further develop their civilization.
The answer is C, although the other options are important as well, in this case, C is the answer you are looking for