Final answer:
Thrashing causes the CPU utilization to decrease as it results in the CPU waiting for data transfers between RAM and the disk rather than computing.
Step-by-step explanation:
It addresses the concept of thrashing in operating systems, which is related to the performance issues that occur when a system is swapping data between RAM and the hard disk too frequently. When thrashing occurs, the CPU utilization decreases because the CPU spends more time waiting for data to be read from or written to the disk, rather than performing actual computations.