Can the language in A not be reasonably interpreted such that it's describing two different groups of people?

If A were to be true, it would mean that many more people moved out of the city than moved in, e.g., 20,000 people moved out and 10,000 moved in, which negates the possibility that perhaps only 10 people moved out and 5 people moved in, and that the difference could be negligent due to a high birth rate. Shouldn't that make A true? #help (Added by admin)