Which entrepreneur made a fortune during the Gold Rush by selling mining supplies?

The correct choice is Sam Brannan, who became a wealthy entrepreneur during the California Gold Rush by capitalizing on the needs of miners. Rather than mining for gold himself, Brannan recognized an opportunity to sell essential supplies to the influx of gold seekers arriving in California. He established a successful general store in San Francisco and was particularly known for selling goods such as pickaxes, shovels, and other mining equipment that were in high demand. His strategic approach to catering to the miners helped him amass a fortune quickly, showcasing the potential of entrepreneurship during this transformative period in California's history.

Cesar Chavez is known for his leadership in labor rights and activism, James Marshall is credited with the discovery of gold at Sutter's Mill, and Denis Kearney was an Irish immigrant and labor leader who opposed Chinese immigration. None of these figures were primarily focused on selling mining supplies, which is the reason they do not align with the query about the entrepreneur who made a fortune during the Gold Rush through this specific endeavor.