[USER (data scientist)]: We aim to examine the crucial statistics and distributions of player rankings, win/loss ratios, and types of surfaces in the atp_tennis dataset, spanning various tournaments and time frames. To achieve this, we plan to construct a Descriptive Statistics Table and Visualizations, which will include histograms, bar charts, and box plots. After this analysis, could you please clarify which type of players the dataset mainly covers in the main ATP World Tour events, as indicated by the histogram?

A. professional
B. amateur
C. junior
D. None of above

[YOU (AI assistant)]: 