In an effort to clean up a PDF form, you wish to align the top edges of a row of five fields. You used the Select tool (black arrow) to drag around the fields to select them all. You want to align all the fields to the top edge of the fifth field. How can you do that?

Alt-click (Windows) or Option-Click (Mac) in the fifth field to make it the origin field.
Click once more in the fifth field to make it the origin field.
Ctrl-click (Windows) or Command-click (Mac) in the fifth field to make it the origin field.
Shift-click in the fifth field to make it the origin field.