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.
Q: Statement: But humans are still the only intelligent life--right? Choices: 1. Humans are still the only life that is intelligent enough to drive a car, right? 2. Humans are still the only intelligent beings, correct? 3. I know humans aren't the only intelligent life on this planet.
A:
3