Question

correct the text by inserting or removing commas. there should be a total of two commas.(note: in this skill, serial commas are not optional.)1on december 12 2013 katie attended the london premiere of her friends musical.

Explanation:

1. In date formatting, a comma is needed between the day and year when the date appears at the start of a sentence.
2. A second comma is required after the full date to separate this introductory phrase from the main clause of the sentence.

Answer:

On December 12, 2013, Katie attended the London premiere of her friend's musical.