Definition: In this task, you're given a statement and three sentences as choices. Your job is to determine which sentence can be inferred from the statement. Incorrect choices change the meaning in important ways or have details that are not mentioned in the statement. Indicate your answer as 1,2, or 3 corresponding to the choice number of the selected sentence.
Input: Statement: They do not understand. Choices:  1. The concepts discussed in class were to advanced for them to understand. 2. They were too stupid to understand even the simplest things. 3. Unfortunately they just don't understand.

3