Question

Which sentence uses commas correctly? A. Penguins, rheas and, ostriches are birds that cannot fly. B. Rice, beans, and tortillas are foods commonly eaten in Mexico, Guatemala, and Costa Rica. C. Hot chocolate requires cocoa, milk, sugar, and, marshmallows. D. Australia's possums live in treetops sip nectar and only come out at night.

Answer 1

Well D is wrong because there are no commas C us wrong because you don't put a comma after And so B is the correct answer

Answer 2

The sentence that uses commas correctly is B) Rice, beans, and tortillas are foods commonly eaten in Mexico, Guatemala, and Costa Rica.
You have to add a comma in front of and.