Question

which is the simplest option that sole proprietors can use to post an advertisement about the sale of their small businesses

Answer 1

Craigslist is always a good option for selling most anything. It allows the seller to advertise to both the local market and nearby cities, as well as any other cities in the United States and abroad. It costs nothing to advertise on Craigslist and once a login is established, it is extremely easy to place an ad.