To examine the Exhibit， press the Exhibit button. While a developer is compiling a C program， "vmstat 120 10" is run to determine the cause of a performance problem.  Using the vmstat output as shown in the exhibit， which of the following conclusions is most appropriate to draw about the machine？（）

• A、 The machine has too many users.
• B、 The machine has an I/O bottleneck.
• C、 The machine has a CPU bottleneck.
• D、 The machine has a memory bottleneck.