Final answer:
Bar graphs use the height of bars to compare quantities. If London were included on the bar graph, the bars for it would be close to the amounts shown for B. Naples. Therefore, the correct option is B. Naples.
Step-by-step explanation:
Bar graphs use the height of bars to compare quantities. In this case, we are comparing the population sizes of different countries. Figure A7 represents the data in a bar graph, with the height of each bar corresponding to the population of each country. If London were included on the bar graph, we would compare the height of its bar to the bars of other cities like Florence, Naples, Paris, and Palermo. So, the answer would be B. Naples.