Here's a problem to solve: A student has one liter of feathers and one liter of iron nails. Which statement best compares the masses of the two samples?

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

- A: The masses cannot be compared without a balance.
 
- B: The mass of the feathers is less than the mass of the nails.
 
- C: The mass of the feathers is the same as the mass of the nails.
 
- D: The mass of the feathers is greater than the mass of the nails.
 