The correct option is B
Before the gold rush, San Francisco was a tiny village, and with the fever the village became a city. Schools, roads and churches were built, and other towns were founded. A legal and governmental system was created, which led to the admission of California as a state of the Union in 1850. New means of transportation, such as the steamboat, entered service in the state, and railway lines were laid . The business of agriculture was also started, the second fastest growing item in California.