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.
Q: Statement: The impact of screening on referral and intervention, as well as outcomes such as reduced risk behaviors, must be demonstrated. Choices: 1. We must show the overall impact of intervention. 2. Reducing risk behaviors is positive in the long run. 3. We do not know the impact of screening on referral and intervention.
A:
1