Answer :
The fundamental cause of the Peloponnesian War was Sparta's fear and jealousy of the power and wealth of Athens.
When Athens created an alliance with Corcyra in 433, and started to besiege Potidaea, it threatened the position of Corinth.
Sparta also feared that Athens was becoming too powerful but tried to prevent war.
So,after reviewing the causes of the war,I have concluded the best answer to be be the choice :
B) Sparta's fear and jealousy of the power and wealth of Athens
When Athens created an alliance with Corcyra in 433, and started to besiege Potidaea, it threatened the position of Corinth.
Sparta also feared that Athens was becoming too powerful but tried to prevent war.
So,after reviewing the causes of the war,I have concluded the best answer to be be the choice :
B) Sparta's fear and jealousy of the power and wealth of Athens