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: However, cost models have significant limitations in accuracy unless their underlying assumptions of system size and cost drivers are carefully chosen and reflect the agency's previous experience in system development. Choices:  1. Cost drivers aren't an important factor, so no thought goes into choosing them. 2. Cost models aren't usually too accurate, but sometimes they can be. 3. Cost models have major limitations in accuracy.

3