Which of the Following Events Was a Turning Point That

Which of the following events was a turning point that allowed many Mexican gardeners to establish their own businesses in the United States?

A) The election of Barack Obama because he immediately upon taking office made any Mexican working in this country a legal citizen.
B) Changes in the labor laws in California that made it easier for any entrepreneur to establish his own business, without references or bank accounts.
C) The Immigration Reform and Control Act (IRCA) in 1986, which offered amnesty/legalization to any formerly undocumented immigrant acted as a catalyst to allow these people to work legally.
D) Changes in the child labor laws, because previously very young children were working as gardeners, and when the government made it impossible for these youngsters to work legally it opened the field to older people.