1.) I prefer shopping in supermarkets because there are more things to buy there. There's also more customer service. Security is better as well.
2.) Sometimes I can't find exactly what I'm looking for in a small shop. Then I have to go to a bigger store anyway. Plus small shops charge more for certain items that you could get cheaper in a bigger store.
The answer is either A or B. The use of complex sentences can make it seem as if time has slowed down, but it also increases the reader's understanding.
