Here's a problem to solve: The ice cubes in a freezer are melting. Which change most likely is causing the ice cubes to melt?

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

- A: a decrease in the mass of the ice cubes
 
- B: an increase in the mass of the ice cubes
 
- C: a decrease in the temperature inside the freezer
 
- D: an increase in the temperature inside the freezer
 