Among the options provided, the following is a notable setback for mixed economies:
Consumers don't have enough choices because the government is in control of everything.
In a mixed economy, while there is a level of government intervention, it generally coexists with a market-driven economy. However, excessive government control can limit consumer choices, which is a criticism often leveled against mixed economies.
The other options, while they may relate to issues faced in mixed economies, do not capture the essence of a setback as directly as the one mentioned above.