How to auto fit column width in MS Excel?

How to auto fit column width in MS Excel?
A: Double clicking on column name on worksheet
B: Double clicking on column right border on column header
C: Double clicking on column left border on column header
D: None of these

Double-clicking the right border of a column header in MS Excel auto-fits width to content. Other actions like clicking column name are incorrect. This feature optimizes spreadsheet layout improving readability. Understanding auto-fit enhances data presentation efficiency critical for managing large datasets in analytical work.