The correct answer option is A. The Persian Wars began.
<u>Explanation:</u>
Out of the events mentioned in given answer options, we are to determine whether which of them happened first.
The correct option is 'The Persian Wars began'.
The Persian War began in 500 BC as a result of a revolt between the Greek cities in Asia Minor against the Persian conquerors.
The assistance given to the Ionians in their rebellion against the Persia and Darius (its ruler) became the main reason why the whole conflict started.
