Here's a problem to solve: Four rods of equal thickness but made of different metals were tested with equal amounts of weight to see which was most flexible. Which of the following is the best way to report the results of this experiment?

Among the 4 following options, which is the correct answer?

- A: a list of each type of rod used
 
- B: a sketch of each rod before testing
 
- C: a table showing how much each rod weighed
 
- D: a bar graph showing how much each rod bent
 