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: The biggest challenge during the construction phase is managing changes resulting from such sources as scope of work changes by the owner, errors and omissions in the construction documents, and unknown or changed site conditions. Choices:  1. Managing changes is very easy during construction projects. 2. Managing changes is difficult for construction managers. 3. Managing changes is the hardest part of construction.

3