ANSWER:
The correct answer is A. There may be other hitters in the 320s, but they didn't make the top 30.
Explanation:
Here is a histogram displaying the top 30 lifetime batting averages in baseball history. This distribution of data shows lots of lifetime averages in the middle classes, but tails off sharply at both the upper and lower ends. What best explains the fact that there are very few averages in the lowest class?
The correct answer is A. There may be other hitters in the 320s, but they didn't make the top 30.