Help please really fast

Which of teh following would explain the importance of the trans-siberian railroad to russia's economy? (schoology test)

Compared with the land in the highlands, the lowlands region of england a) rockier and more difficult for farmingb) the center of business and industryc)richer in coal reservesd)covered by more fertile farmland d) covered by more fertile farmland

In russia which of these challenges affects the transportation of both petroleum products and other goods?