Motion: College graduates should be encouraged to be self-employed.Argument: Job security keeps decreasing nowadays. Even if a college graduate finds a stable job, it is highly possible for him to lose it after a period of time.Which of the following sentences might the debater use to repeat, or identify the argument he is going to refute?
选项：

A:However from our perspective, jobs are no longer as stable as they once were...;
B:Due to the fact that jobs are no longer as stable as they once were, ...;
C:As is mentioned by the propositional side, jobs are no longer as stable as they once were,...;
D:So, we believe that jobs are no longer as stable as they once were...