The correct answer is option 1: Fiords. Fiords are not a result of underground water action. Fiords are long, narrow inlets with steep sides or cliffs, created by the movement of glaciers. They are a type of coastal landform, not associated with underground water action.

Option 2, Sinkholes, are created when underground water dissolves limestone or other soluble rocks, causing the ground above to collapse.

Options 3 and 4, Stalactites and Stalagmites, are both formed by the deposition of minerals from dripping water in caves. Stalactites hang from the ceiling, while stalagmites grow up from the floor. These formations are created over thousands of years as water seeps through the ground and forms mineral deposits.

Alert - correct answer should be: None. All options are actually the result of underground water action except for Fiords.