What is the common feature of Vietnamese and Thailand silk weaving?

• A. 
  They have the same type of silk with diverse styles and designs.
• B. 
  Viet Nam and Thailand were the centres of silk worm production during the war
• C. 
  The ethnic groups play an important role and they use natural dyes
• D. 
  Young girls are expected to learn how to raise silk worms and make natural dyes using indigo.