The main function of a computer's **processor** is to process the instructions provided by the software; it also coordinates the activities of the other units.
1. **Processor (A)**: The processor, also known as the central processing unit (CPU), is like the brain of the computer. It interprets instructions and performs calculations. It executes program instructions and processes data.
Therefore, in the context of the given question, the correct answer is **A. processor**. The processor is crucial for the functioning of a computer as it carries out the necessary operations to run software and manage the overall system.
