One cause of the Peloponnesian War was

a. invasion of Athens by the Persians.

b. invasion of Crete by the Mycenaens.

c. conflict over control of the Delian League.

d. economic and commercial rivalries among the city-states.

D?

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Yes, the correct answer is d. economic and commercial rivalries among the city-states. Now, let me explain how to arrive at this answer.

To determine the cause of the Peloponnesian War, it's important to have a basic understanding of the historical context. The war took place in Ancient Greece between the Athenian Empire (led by Athens) and the Peloponnesian League (led by Sparta). It lasted from 431 to 404 BCE.

Option a, invasion of Athens by the Persians, actually refers to an earlier event called the Persian Wars, which occurred in the early 5th century BCE. These wars involved the Persian Empire's attempts to conquer Greece and were not the cause of the Peloponnesian War.

Option b, invasion of Crete by the Mycenaeans, is not relevant to the Peloponnesian War. The Mycenaeans were an ancient Greek civilization that existed prior to the classical period of Greece, which is when the Peloponnesian War took place.

Option c, conflict over control of the Delian League, is partially correct but not the main cause of the war. The Delian League was an alliance of Greek city-states, led by Athens, formed to counter Persian aggression. While disputes over leadership and control within the Delian League did occur, they were not the primary cause of the Peloponnesian War.

Option d, economic and commercial rivalries among the city-states, is the most accurate answer. The various city-states within Ancient Greece, including Athens and Sparta, competed economically and commercially for resources, trade routes, and influence. These rivalries, combined with political tensions and a desire for power, ultimately led to the outbreak of the Peloponnesian War.

So, in summary, the correct answer is d. economic and commercial rivalries among the city-states.