Select the reasons why the Chinese kept silk making a secret. A: They did not think other cultures needed silk.

B: Silk was in demand but difficult to produce and therefore valuable.

C: The Chinese guarded the secret to control production and keep the profits.

D: Their trade depended on silk and they did not want to lose trading power.

D. is the answer if not then c. is the answer

Explanation:

"a shortage of traditional labor created new opportunities in the workplace. a major cause of the internment of japanese americans during world war ii was. racial prejudice. in the early 1940's, the "destroyers-for-military-bases deal" with great britain and the lend-lease act were evidence that the united states."