Why Did the Athenians Ally with the Spartans in the Battle

Multiple Choice

Why did the Athenians ally with the Spartans in the battle of Mantinea (362 B.C.E.) ?

A) The Spartans swore to respect Athenian territory if Athens helped them conquer the Thebans.
B) The Persians had begun to attack Greek trading vessels in the Aegean.
C) They hoped to throw off Macedonian rule while Alexander was campaigning in Persia.
D) They feared the growing might of Thebes.