Answer:
November 2011
Explanation:
Based on the information given if the company purchased 20 sofas in the month of November 2011 in which the company paid the amount of $3,000 for an advert that ran in the local newspaper in the same month of November 2011 which simply means that the month in which the advertising costs should be expensed is the month of NOVEMBER 2011 which is the month the company paid the amount of $3,000 for advertising in the local newspaper.