Sparta joined with Athens because Sparta was

too weak to confront the Persians alone,

а.

C

afraid that Persia threatened Spartan miltary

control of Greece

none of the above

b. planning defeat the Persians first and then attack d.

Athens

A. Sparta was

too weak to confront the Persians alone

Explanation:

Sparta and Athens were brought together as allies due to the Persian invasion of Greece.

The Great Peloponnesian War, also called the First Peloponnesian War, was the first major scuffle between them. It became a 15-year conflict between Athens and Sparta and their allies. Peace was decreed by the signing of the Thirty Years Treaty in 445 B. C., effective until 437 B. C., when the Peloponnesian War began.

The Peloponnesian War is the name given to the long series of conflicts between Athens and Sparta that lasted from 431 until 404 BC.

However, the more immediate reason for the war was Athenian control of the Delian League, the vast naval alliance that allowed it to dominate the Mediterranean Sea.