Final answer:
A map, a padlock, and a typewriter all have keys, which is the element that ties them together, making option A the correct answer. Option A is correct.
Step-by-step explanation:
The commonality between a map, a padlock, and a typewriter is that they all have keys. Option A) 'They all have keys' is the correct answer to the question. Maps have a legend or key that explains symbols and scales; typewriters have keys that are pressed to create letters, numbers, and symbols on paper; and padlocks have physical keys that are used to unlock them.
The common characteristic among a map, a padlock, and a typewriter is that they can all be used to secure information. While a map helps provide a visual representation of geographical information, a padlock secures physical objects or spaces, and a typewriter was used to write and keep written information safe before digital technology. They all serve the purpose of protecting data or ensuring privacy in different contexts.