Here's a problem to solve: In a copper wire, a temperature increase is the result of which of the following?

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

- A: an increase in the size of the copper particles
 
- B: a decrease in the mass of the copper particles
 
- C: an increase in the motion of the copper particles
 
- D: a decrease in the distance between the copper particles
 