From paragraph 3, we can infer that when Mr. Sam was very young, he mostly helped his parents by

• A. 
  applying the woodblocks with proper paints and pressing them on sheets of paper
• B. 
  applying seashell powder to make various paints for painting making
• C. 
  drawing with a pen and using proper paints to make many copies of paintings
• D. 
  collecting and taking the paintings to the market for sale