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.