Which promotion is best for SEO

All of these areas are great for linking. Whatever you do, just make sure it's done naturally. I can't tell you how many times people said they got over thousands of backlinks in a week and then can't seem to figure out why there site is no longer indexed. In addition, whichever methods you choose, be sure that you have links for a vary of domain extensions (.edu are good) and a variety of PR ranking. Be sure to use anchor text back to your site as well.

 

Article submissions are the main ones I use. You just need to make sure diversify your anchor text!

 

With the 3 choices you given i will said directories will work better cause Google now give more privilege on local business site to rank better in local search engine .
So try to make your site appear is directories, contact us page, google place to show you are local business.
Social Bookmarking might not work that well cause google now start give low weight to short content posting in SEO . Classified it still help in images SEO if you would like to rank your image.

 

An off-page activity and social media is best process fro promoting your site.