Answer:
it's A, under 20
Step-by-step explanation:
if you add 15 to 45 you get 60, 30 plus 60 is 90, completing that side of the chart.
then, add 9 to 45 to get 54. there are 54 people under 20, and there are 36 people over 20. so the answer is A, there are more people under 20.
