Question

Which sentence uses commas correctly?

We toured an organic farm, a conventional farm, a food processing plant, and a grocery store.


We toured, an organic farm, a conventional farm, a food processing plant, and a grocery store.


We toured an organic, farm, a conventional, farm, a food processing plant, and a grocery store.


We toured, an organic farm a conventional farm, a food processing plant and a grocery store.

Answer 1

b is the correct one I think but not sure