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: The system stretches up to 16 km (10 miles) inland and includes Green Grotto, a vast cavern with an underground lake where stalactites are clearly reflected in the glassy water. Choices:  1. The system stretches at least 20 miles inland. 2. There is an underground lake in the Green Grotto cavern. 3. The Green Grotto cavern is over 500 feet high.

1