The option which would not be an example of a long-term goal is C. run a 5k in three weeks. The reason why this is not a long-term goal is because it isn't that far into the future - it will happen in just three weeks, whereas the other options are far more longterm, given that they would happen in eight months, one year, and two years. This would be considered a short-term, not a long-term goal.
