According to the passage, why would the landowners respond to environmental concerns a. They wish to stimulate economic growth. b. They wish to improve their public image. c. They have a tradition of cooperating with the government. d. They are afraid of federal legislation.

中国发现的陶器最早可以追溯到什么时期？（）

A、新石器时代早期

B、旧石器时代中期

C、夏朝

D、商代