Here's a problem to solve: Cars were once assembled completely by hand. Industrial robots now assemble many car parts. What is a positive effect of using robots?

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

- A: The assembly takes more time.
 
- B: More workers are needed for assembly.
 
- C: There are fewer injuries to workers.
 
- D: More mistakes are made during the assembly.
 