Answer:
Grains arranged in parallel layers
Explanation:
The following items can be considered as something that producers can offer to compete for more customers: Better Customer Service. The good you are to deal with your customers the more they will go back to you. Better Product Quality. Customers want the best for themselves and the producers are looking at what is best for their customers.
I believe that would be B
As my memory serves me well, innovations like the production of gunpowder, tea, and silk are usually attributed to D. China
