Concept:Input devices are hardware components that send data and instructions to the CPU for processing.
Explanation:The CPU depends on input devices like a keyboard or mouse to receive information.
An input device converts user actions into signals that the CPU can understand.
A bus is only a communication pathway that transfers data, not a device that sends information.
Output devices display or present the processed results from the CPU.
The processor itself is the CPU, so it does not send information to itself.
Therefore, the device that sends information to the CPU is an input device.
Answer:B. input device