Final answer:
The 'Created (Date) System column' is the ideal choice for tracking the date and time when a row was added, as it captures this information automatically and accurately.
Step-by-step explanation:
The best column type for tracking when a row was added to a sheet is d) Created (Date) System column. This column automatically records the date and time when a new row is added to the sheet, providing a precise timestamp for when each entry was created. Unlike other column types, the Created (Date) System column does not require manual entry and ensures accurate tracking of data entries.