Question: How can I know how much paint is in a tightly sealed can?

  Options: 
 A. After you finish painting, and before you close the paint can, paint a line across the label to show the paint level, that way you’ll know how much and what color the paint is without opening it.
 B. After you finish painting, and before you close the paint can, paint a line across the inside of the can to show the paint level, that way you’ll know how much and what color the paint is without opening it.
Answer: A