B. Henry has 15 classmates and each has between 0 and 6 pets.
Explanation:
We have been given a dot-plot and we are asked to select the correct situation represented by given dot-plot.
A. Each of Jessica's 6 friends has between $0 and $15 in his or her wallet.
We can see that total number of dots is 15 (2+4+2+3+2+1+1) and no point represents 15 dots. The situation would have been true for each of Jessica's 15 friends has between $0 and $6 in his or her wallet. Therefore, option A is not a correct choice.
B. Henry has 15 classmates and each has between 0 and 6 pets.
Since the total number of dots is 15, so we can say that each dot represents Henry's friend. Since our range is 0 to 6, so the numbers on line represents number of pets. Therefore, option B is the correct choice.
C. Billy bought 0 and 6 shirts from each of his favorite 6 stores.
We can see the largest number of dots on a point is 4, so the largest number of shirts bought by Billy should be 4. Since 6 dots are not on any point, therefore, this is not a correct choice.
D. Across the state, 15 cities were given a score between 0 and 15 regarding the cleanliness of their community.
Since there are 15 dots, so we can say that each dot plot represents one city. But the range of line is from 0 to 6, therefore, it can represent a score between 0 and 6, therefore, option d is not a correct choice.