Answerbank don't choose the adverts to show.
Basically they design the web site and leave "spaces" that are filled by the adverts (which are actually chosen by Google or similar companies)
When I look at AB I probably get totally different adverts to you, in fact each person looking at AB probably gets their own unique set of adverts.
The type of adverts you get may be based on all sorts of things - what web pages you have been looking at (for cookers, TVs, cameras, holidays etc), also what you may have searched on recently (cricket scores, horse racing results, hotel prices), even what you have been putting in your emails (such as "I have been looking for a holiday in Italy").
All these things can affect what adverts you see.
Also note that while web sites can guess where you live (which area) based on your broadband, they don't know exactly, so it is hard to place adverts for particular parts of the country.
So as you can see, what adverts you get is quite a complex business.