Which of the following statements is true regarding chinese history and technology?
a. as the world's largest nation, china has always set the mark for technological innovation and progress.
b. in the ming and qing eras, chinese technological innovation was limited, but during the tang and song dynasties china led the world in technological advances.
c. in the tang and song eras, chinese technological innovation was limited, but during the ming and qing eras, china led the world in technological advances.
d. in the tang and song eras, technological innovation was directly tied to silk and porcelain production, but during the ming and qing eras, technology was tied to the expanding maritime trade.