The correct answer is A) it took some control away from the state.
Allowing private ownership of businesses changed trade and industry in China in that it took some control away from the state.
The economic reforms established by Chinese leader Deng Xiaoping in 1978, represented the opening of China to foreign investment and to trade with western countries. The decision was applauded by the international community and allowed China to improve its economic conditions. The big problem had been that the Chinese economic activity was totally under the State's hands. The government couldn't do much for the economy and Xiaoping thought that if the economy was to grow, a reformation was needed.