Which of the following describes a correct sequence of events in the mining of gold in California? *


A. The miners first "panned" for gold in shallow streams. The heavier gold pieces sank to the bottom of the pans. Once the obvious deposits of gold were taken from these streams, miners returned to the eastern United States.


B. At first, miners "panned" for gold in places where river currents slowed. They also used the sluice, which was a long wooden box that they placed in streams. Finally, mining companies brought in rock-crushing machines to extract gold on a large scale.


C. The gold rush began when miners began blasting away large areas of mountains to expose gold deposits. Some of this gold found its way into streams, and the miners "panned" that gold. Finally, the miners continued northward into Canada, where they failed to find any more gold.


D. When the first miners arrived, gold was so abundant that they could gather it out of shallow streams. When all of that gold had been taken, miners began blasting with dynamite to uncover deeper gold deposits. Finally, miners began to use electronic equipment to find deeply buried gold deposits.