Which sentence is the main idea?
4. (1)The palaces of the civilization of Minoan Crete (at its peak from about 2000 to 1500 B.C.E.) lacked fortification, and the art lacked angry warlords. (2)Women’s clothing, at least for the upper class, was so elegant that it would be eye-catching at a modern Milanese fashion show. (3)Two circumstances help to account for what was so obviously a world of peace and prosperity in Minoan Crete. (4)One was that, living on an island in an age unfamiliar with seaborne invasions, the Minoans must have felt insulated from foreign attack. (5)The other was that a friendly climate and terrain suitable for pasturing and growing orchard crops (grapes, olives, nuts) freed the Minoans from heavy reliance on labor-intensive agriculture. (6)This meant that not only did people have more leisure than their counterparts in agricultural societies, but produce was more diverse, providing a greater hedge against famine and allowing for long-distance trade in goods that were less easily produced elsewhere. (7)To take but one example, the Minoans had plentiful wool and various kinds of natural dyes. (8)Since wool, unlike linen, is easily dyed, Minoans were exporting “exotic” multipatterned luxury cloths to Egypt as early as about 2000 B.C.E.