The assembly takes more time. More workers are needed for assembly. There are fewer injuries to workers. More mistakes are made during the assembly.
I gave my students this multiple choice question: Cars were once assembled completely by hand. Industrial robots now assemble many car parts. What is a positive effect of using robots?

Only one answer is correct among these 4 choices:
- The assembly takes more time.
- More workers are needed for assembly.
- There are fewer injuries to workers.
- More mistakes are made during the assembly.

Could you tell me which one is correct?

There are fewer injuries to workers.