Why was persia ultimately unsuccessful in conquering greece?
a. persia had fewer soldiers than greece to fight its battles.
b. athens and sparta were unbeatable when the two were united.
c. persia’s distance from greece worked to its disadvantage.
d. persia’s leadership did not match the well-trained greeks’ leadership.

I believe the answer is: B.Athens and Sparta were unbeatable when the two were united.

Both athens and Sparta possess unique traits in their millitary. The athenian soldiers were known for their ability to employ complicated battle tactics along with their modern millitary equipment and the Spartan was known to be extremely strong and fearless warriors.

B on edge:)

Explanation:

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this is a good question! i'll do some research and come back when i have the answer!