Athens and Sparta were two great city-states in ancient Greece, and they were often in conflict. What was the cause of the Peloponnesian War in the 5th century BC? A.
Athens kidnapped a high-ranking Spartan official.
B.
Athens blocked Spartan trading routes.
C.
Sparta feared the growth and the power of Athens.
D.
Sparta attacked Mediterranean allies of Athens.

Correct answer is C.  Sparta feared the growth and the power of Athens.

Explanation:

Option A is not correct as this never happened, therefore this is not correct.

Option B is not correct as Sparta wasn't trading force, so in that sense they couldn't interfere in that area.

C is correct as the power of Delian league was a growing danger for Sparta's Peloponnesian league.

D is also not correct as Sparta had no strong navy.

i would say b. or c.