How did geography impact Sparta’s military tactics during the Peloponnesian War? Sparta did not have to worry about an invasion because it was located on top of a mountain.
Athens was located on an island, forcing the Spartans to use many ships to transport its army.
The stronghold of the Delian League was on Delos, requiring Sparta to have a strong navy.
Athens's location made it difficult to attack, forcing the Spartans to destroy farmland and crops.

D-Athens's location made it difficult to attack, forcing the Spartans to destroy farmland and crops.

Explanation:

Athens was located on a hill behind walls.  Sparta had to draw them out from behind the walls.  The Spartans destroyed the crops and farmland.

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offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering