Concept:Ctrl+0 is a keyboard shortcut used in spreadsheet programs to hide the active column.Explanation:In applications like Microsoft Excel or Google Sheets, pressing Ctrl+0 hides the column where the cursor is currently positioned.This shortcut helps temporarily remove columns from view without deleting data.To unhide a hidden column, use the shortcut Ctrl+Shift+0 (may require enabling on some systems).Note that Ctrl+9 hides the selected row instead.Keyboard shortcuts like these help speed up data organization and declutter large spreadsheets.Answer:D. Hide selected column