Final answer:
To conceal sensitive data in a worksheet, you would click 'Hide' on the shortcut menu. This action hides the entire worksheet, making the content invisible to viewers but still part of the workbook.
Step-by-step explanation:
To prevent sensitive data from being seen in a worksheet, you can hide the worksheet by clicking Hide on the shortcut menu. The options listed pertain to different security and display features in spreadsheet programs like Microsoft Excel.
Hiding a worksheet makes it invisible to anyone looking at your workbook unless they know how to unhide it. Protect refers to restricting the editing of a worksheet's content, whereas Encrypt is about securing the entire document with a password. Format relates to changing the appearance of the worksheet's content but not its visibility. The correct answer to the question is a) Hide.