Definition: In this task, you're given a statement, and three sentences as choices. Your job is to determine which sentence clearly disagrees with the statement. Indicate your answer as '1', '2', or '3' corresponding to the choice number of the selected sentence.
Input: Statement: However, Athenian involvement provoked the Persian king Darius to invade the Greek mainland. Choices:  1. The Athenians successfully deterred the Persians from attacking mainland Greece. 2. The Greek mainland was invaded by Persia during the reign of Darius. 3. The Persian invasion of the Greek mainland was unsuccessful.

1