when separating items in a list, a writer should\nend the list with a colon.\nseparate the items with…

when separating items in a list, a writer should\nend the list with a colon.\nseparate the items with colons.\nadd a comma after the “and” before the last item.\nadd a comma before the “and” before the last item.

when separating items in a list, a writer should\nend the list with a colon.\nseparate the items with colons.\nadd a comma after the “and” before the last item.\nadd a comma before the “and” before the last item.

Answer

Brief Explanations:

In English writing, when listing items, a comma is added before the "and" preceding the last item to separate it from the other items in the list. A colon is used to introduce a list, not to separate items within it. And adding a comma after "and" is incorrect usage.

Answer:

add a comma before the "and" before the last item.