Freight costs were reduced to 10% of what they had been because of ______.

A．The Erie Canal connected Lake Erie and the Hudson River.
B．Economists are for the opinion that places where farming is done are good for making raw materials into finished goods.
C．Wagons drawn by horses or oxen soon proved to be better and cheaper than canal transportation.
D．The coming of the railroads caused New York to become less important as a shipping center.

A．Because the ships were lime crowded on the trip back to New York.
B．Because shipping companies were eager to fill their ships with passengers on the return trip from Europe.
C．Because the shipping companies wanted to develop travelling industry in New York.
D．Because few Europeans longed to visit New York.