The graph shows the relationship between the weight of silver and the total cost. Which of the following is true? A.
 The graph shows a proportional relationship.
 B.
 The point (2,34) means that 34 pounds of silver cost $2.00 per pound.
 C.
 The point (1,17) shows the constant of proportionality.
 D.
 The point (0,0) means that 0 pounds of silver cost $0.00.
 E.
 The point (4,68) means that $4.00 is the cost for 68 pounds of silver. (Total class