The proper Excel Column Rule states:

The proper Excel Column Rule states:

• A. Each column should contain only one type of information.
• B. Columns can mix data types.
• C. Columns must be sorted alphabetically.
• D. Columns must be merged with data.

Answer: (A)

In Excel, a column should represent a single data field, containing only one type of information. This consistency is what makes data easy to manage and analyze. When every entry in a column shares the same data type or meaning, formulas that reference that column work reliably, and operations like sorting, filtering, and aggregating produce correct results. For example, a column meant for dates should contain date values only; mixing in text or numbers can confuse date recognition, break calculations, and distort charts or pivot tables. If a column holds diverse data types, Excel can misinterpret values, break formulas, and make validation or data cleaning much harder. Sorting and analyzing data becomes unpredictable because the column no longer behaves as a single data field. The rule isn’t about alphabetical sorting or any requirement to merge columns—those practices hinder data usability. Keeping columns dedicated to one type of information keeps the dataset well-structured and usable for reliable analysis.

In Excel, a column should represent a single data field, containing only one type of information. This consistency is what makes data easy to manage and analyze. When every entry in a column shares the same data type or meaning, formulas that reference that column work reliably, and operations like sorting, filtering, and aggregating produce correct results. For example, a column meant for dates should contain date values only; mixing in text or numbers can confuse date recognition, break calculations, and distort charts or pivot tables.

If a column holds diverse data types, Excel can misinterpret values, break formulas, and make validation or data cleaning much harder. Sorting and analyzing data becomes unpredictable because the column no longer behaves as a single data field. The rule isn’t about alphabetical sorting or any requirement to merge columns—those practices hinder data usability. Keeping columns dedicated to one type of information keeps the dataset well-structured and usable for reliable analysis.