Which best explains the successful development of agriculture in the desert climate of the American Southwest by American Indian cultures such as the Pima, Hopi, and Hohokam? ' a) People of the Southwest were instructed in cultivating drought-tolerant crops by traders from civilizations in present-day Mexico. b) People of the Southwest developed systems of canals to divert water from nearby rivers to irrigate their crops. c) People of the Southwest developed a seasonal calendar that allowed them to predict the best times of year to plant and harvest. d) People of the Southwest primarily cultivated drought-resistant grasses for animal feed and subsisted on meat from livestock.