What is the simple meaning of kernel panic?

Correct answer: System stopping due to a serious error in the kernel

The kernel is the core part of an operating system that manages essential resources such as memory, processes, and hardware access. A kernel panic occurs when the kernel detects a severe condition from which it cannot safely continue, such as a critical memory fault, invalid operation, or serious driver and hardware interaction. To prevent further corruption, the system may halt, display an error screen, or restart. This is more fundamental than an ordinary application crash, which usually terminates only one program while the operating system continues. A changing monitor colour, an empty printer, or a washed mouse pad is not a kernel error. Hence option A is correct.