Although Damon had ample time earlier in the month to complete the paper he is scheduled to present at a professional conference tomorrow morning, he repeatedly put off doing it.
Conclusion
Because of procrastinating, Damon will have to choose between professional and family responsibilities.
Evidence
Damon procrastinated finishing the paper he's scheduled to present tomorrow morning. He could only get it done if he worked constantly until then, which would preclude him from going to his daughter's tap-dance recital, which he promised to attend.
Evaluate
The author clearly establishes that Damon can't do both of the things he's promised to do, so he'll have to choose one vs. the other.
(That conclusion isn't exactly true. He could choose to do neither and shirk both of his responsibilities. Go, Damon!)
But we don't care whether the logic is sound. We just care about describing the type of evidence used or the way the author convinced us of her conclusion.
Goal
Look for something like, , but said more in abstract LSAT language.