Final answer:
The largest industry in California is Agriculture, with the Central Valley being one of the most productive agricultural areas in the world.
Step-by-step explanation:
The largest industry in California is Agriculture. California's Central Valley is one of the most productive agricultural areas in the world, producing a wide range of crops such as tomatoes, grapes, almonds, and many other foods. The region is also famous for its wine production, especially in Napa Valley.