MS Excel
By default Excel provides 3 worksheets. You need only two of them, how will you delete the third one?

Right click on Sheet Tab of third sheet and choose Delete from the context menu
None of above
Click on Sheet 3 and from Edit menu choose Delete
Both of above

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MS Excel
Right clicking something in Excel:

Deletes the object
Selects the object
Opens a shortcut menu listing everything you can do to the object
Nothing the right mouse button is there for left handed people

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