Final answer:
The economic benefit that Nativists in California sought from the Chinese Exclusion Act of 1882 was lower labor competition and increased job opportunities for American workers.
Step-by-step explanation:
The economic benefit that Nativists in California sought from the Chinese Exclusion Act of 1882 was B. Lower labor competition and increased job opportunities for American workers. The act was aimed at appeasing those who believed that Chinese migrants were causing pressure on the employment market in the West Coast. By banning Chinese laborers from entering the United States, it was believed that jobs would be available for American workers and labor competition would decrease.