Due to their ability to resist wind, round tents called "yurts" are common living accommodations on the Eurasian steppe. The steppe is a dry, flat grassland that experiences extreme gales. Which choice most effectively combines the sentences at the underlined portion?
1) Due to their ability to resist wind, round tents called "yurts" are common living accommodations on the Eurasian steppe, which is a dry, flat grassland that experiences extreme gales.
2) Due to their ability to resist wind, round tents called "yurts" are common living accommodations on the Eurasian steppe, a dry, flat grassland that experiences extreme gales.
3) Due to their ability to resist wind, round tents called "yurts" are common living accommodations on the Eurasian steppe, which experiences extreme gales and is a dry, flat grassland.
4) Due to their ability to resist wind, round tents called "yurts" are common living accommodations on the Eurasian steppe, a dry, flat grassland that experiences extreme gales.