Final answer:
All of the recent developments in e-commerce except for small businesses flooding the e-commerce marketplace are included in the options provided.
Step-by-step explanation:
The recent developments in e-commerce include all of the following options except D) Small businesses continue to flood the e-commerce marketplace.
The other options, A) Internet-based models of computing, such as smartphone apps, B) Social networking sites becoming a new platform for e-commerce, C) The online demographic of shoppers matching that of ordinary shoppers, and E) Social sharing e-commerce sites extending the market creator business model, are all examples of recent developments in e-commerce.