Correct Answer is (a) Drop
Delete the stash: (except that this last bit doesn't work)
~/tmp/a(master) $ git stash drop !$
git stash drop 60629375d0eb12348f9d31933dd348ad0f038435
'60629375d0eb12348f9d31933dd348ad0f038435' is not a stash reference
Drop is used to remove a single stash entry from a list of stash entries