Start by ordering your data, the pages in each chapter, from smallest to largest - that way you can read it better:
9, 13, 15, 15, 17, 17, 18, 19, 20, 22, 24, 25
A histogram represents the data using a range of values on the x axis (number of pages). For your histogram, the ranges are 0-9, 10-19, and 20-29. On the y axis (number of chapters), you fill in the bar up to how many chapters fall into each of the ranges. You're given data that tells you how many pages are in each chapter, with each data value being a chapter, so just count up how many data values fall into each of the ranges:
For 0-9 pages: 1 chapter (9)
For 10-19 pages: 7 chapters (13, 15, 15, 17, 17, 18, 19)
For 20-29 pages: 4 chapters (20, 22, 24, 25)
Now look at the histograms you're given. Find the one that has the bar filled up to 1 chapter for 0-9 pages, 7 chapters for 10-19 pages, and 4 chapters for 20-29 pages.
Your answer is B.