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Answer A says that they must avoid the greed and excesses brought by materialism. In a socialist government, it is hard to be very materialistic because it is hard to get rich because the means of production are shared by the people. Therefore, it is hard to be very materialistic. This option is false.
Answer B says that they must realize that the government can take away their freedom. Well, with a downgrade from communism to socialism, the government will have less power to do so, and any government can rebuke a freedom if they so wish, so this option is most likely false.
Answer C says that they shouldn't copy the Western countries. Well, to them that really isn't a con. Acknowledgement doesn't make sense as a thing you give in return for a better economic system. This is false.
Answer D says that the Chinese people must accept that there will be a limit placed on their earning power. This is a trade off that goes on with socialism: there is more equality with earning but less wealth you can gain. This is something they must accept, but it is much better than communism. This answer is true.
Therefore, the answer is D) the Chinese people must accept that there will be limits placed on each person's earning power.
I hope that this helps! Have a wonderful day!