What is the name of the technique in which the operating system of a computer executes several programs concurrently by switching back and forth between them?

ANS:B - Multitasking

The right answer is option (B).

In a multitasking system, a computer executes several programs simultaneously by switching them back and forth to increase user interactivity. Processes share the CPU and execute in an interleaving manner. This allows the user to run more than one program at a time.