Final answer:
To restore a PC to a previous state used in a lab, System Restore would be the appropriate method, as it can revert the system back to an earlier point in time. BIOS updates and Registry Modifications are not intended for this purpose, and Task Manager Reset does not relate to system recovery.
Step-by-step explanation:
To bring a PC to the state used in the lab, the option that could have been used is A. System Restore. System Restore is a feature in Microsoft Windows that allows users to revert their computer's state (including system files, installed applications, Windows Registry, and system settings) to that of a previous point in time, which can be used to recover from system malfunctions or other problems. In contrast, B. BIOS Update is usually performed to fix bugs, improve stability, or to enable new hardware compatibility but would not typically restore the operating system to a previous state. C. Task Manager Reset is not a recognized method for restoring a system; Task Manager is used to monitor and manage system processes and performance. D. Registry Modification could theoretically set a system back to a previous state, but it would be highly complex, risky, and not practical for standard system recovery as it involves manually editing the Windows Registry.