Buck did not read the newspapers, or he would have known that trouble was brewing, not alone for himself, but for every tidewater dog, strong of muscle and with warm, long hair, from Puget Sound to San Diego. Because men, groping in the Arctic darkness, had found a yellow metal, and because steamship and transportation companies were booming the find, thousands of men were rushing into the Northland. These men wanted dogs, and the dogs they wanted were heavy dogs, with strong muscles by which to toil, and furry coats to protect them from the frost.
Which sentence best summarizes the first paragraph?
A. Because the discovery of gold, men were quickly going north to seek their fortune, and they needed strong dogs to help the get there.
B. A steady northward movement was make transportation companies rich.
C. Because so many men were going north, finding gold required working all night.