"To accommodate for lack of dependable rainfall" would be the best option as to why the ancient Chinese organized large groups of people to build and maintain irrigation systems, since when rainfall would not come for long periods of time, the crops would likely die without proper irrigation.
The answer is <u>C. Wagon</u>
and the other answers in the quiz are <u>Fighting</u> and <u>Men</u>. I'm with K12 too... I just took the quiz :)
Roosevelt's personality and political philosophy fitted the imperatives far more than they did the fashions of the times, so that the degree to which his behavior in the White House both hastened and shaped the dramatic growth of presidential power over the next seventy-five years must be seriously considered. Temperamentally, Roosevelt craved attention. Once in the White House, especially in view of the changed national and international circumstances, he could not fail to focus national attention on the presidency.