Answer:

Introduction:
In this question, we are discussing the main part of a table that contains numerical information classified in the row and column captions. We need to identify the correct option among the given choices: A. body of the table, B. headnote, C. footnote, D. source note.

Body of the Table:
The body of the table is the main part that contains the numerical information. It is the area where the data is presented in rows and columns. This section provides the actual data and is classified according to the row and column captions.

Headnote:
A headnote is a brief statement or summary that appears at the top of a table. It provides additional information about the table, such as its purpose, context, or key findings. Headnotes are not the main part of the table that contains numerical information.

Footnote:
Footnotes are additional explanations or comments that are placed at the bottom of a table. They provide supplementary information or clarify specific details related to the data presented in the table. Footnotes are not the main part of the table that contains numerical information.

Source Note:
A source note is a citation or reference that provides information about the source from which the data in the table is obtained. It typically includes details such as the author, title, publication, and date. Source notes are not the main part of the table that contains numerical information.

Conclusion:
Based on the given options, the correct answer is A. body of the table. The body of the table is the main part that contains the numerical information classified in the row and column captions. It is where the actual data is presented and analyzed.