Which of the following statements related to productivity growth in China istrue?

a. China has been more successful in developing new technologies than it has in adapting existing technologies developed in other countries.

b. Manufacturing wages have remained stagnant in China due to the increasingly large supply of low-wage agricultural workers that have yet to move to manufacturing jobs in cities.

c. Because of the high birth rate in China, the Chinese labor force will continue to increase.

d. Much of China's growth is likely due to the transition from a centrally-planned economy to a market economy.