Step 1: CPU Functionality.
The Central Processing Unit (CPU) is the primary processing component of a computer.
Step 2: Option Evaluation.
- (A) CPU: This is the correct selection. It processes instructions fundamental to the computer's operation.
- (B) Motherboard: While essential for component interconnection, it does not perform the core processing.
- (C) Speaker: This is an output device and not the central processing unit.
- (D) Scanner: This is an input device and does not drive the computer's core functions.
Step 3: Final Determination.
Option (A) CPU is the correct answer.