Work backward from what makes physical sense. A can cannot be sterilized in a retort (E) or cooled (F) before it is sealed, so Seaming (D) must come before both of those, and Seaming itself needs the air already removed, so Exhausting (C) comes right before it. Exhausting needs the lid loosely on, which is Clinching (B), and Clinching needs the can already full, which is Can filling (A). Chaining these needs backward gives Filling, then Clinching, then Exhausting, then Seaming, then Retorting, then Cooling, exactly option 2. The other three options start with Cooling or Retorting, which cannot happen to an unsealed, unfilled can, so they are eliminated. \[\boxed{\text{Option 2}}\]