Q. Did the customers stop for narrow selection of food?
A. The customers stopped for wider selection of food.
Does it mean the customers just ignored or didn't shop for food?
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To "stop for (something)" means to make a stop in your travels in order to do, buy, or accommodate something. You could say, for instance, "We stopped for a drink on the way home" or "while we were out walking around the block, we stopped for a chat with a neighbor."
So in the context given, "stop for" means the customers specifically came into the store, rather than choosing to pass it by, because of the store's wider selection of food: They made a stop in their travels in order to buy food there.
In the given sentence and without further context I'd imagine it means that the customers came (to a particular shop or salesman) for the wider selection of food that is available at the particular shop. So the sentences should be:
Q. Why did more customers come?
A. The customers came for the wider selection of food
A. The customers came because of the wider selection of food