Q: Given a list of steps and an additional step, determine where the step fits into the original list of steps. A correct answer, correctly places the given step into the set of steps so that it creates a new plausible set of steps. Output must be formatted as 'After step n', where n is the step number after which the given additional step is to be inserted.
Steps: (1) Limestone is located under the soil (2) Rain picks up carbon dioxide as it falls to earth (3) The carbon dioxide in the rain washes through the soil (4) The carbon dioxide turns into acid (5) The acid in the rain gets to the limestone below the soil (6) The acid dissolves the limestone (7) Acid continues to erode the limestone with more rain over time (8) The eroded limestone sometimes forms caves.  
Where does the following step fit into the given list of steps: The rain falls on the soil over the limestone 
A:
 After step 2. 