The question asks about a collection of programs that help control your computer. Let us analyze each option:
- (A) System Software:
System software is a type of software that manages and controls the hardware and provides essential services for the computer's operation. Examples include operating systems (e.g., Windows, macOS, Linux), device drivers, and utilities. System software acts as an interface between the user, applications, and the computer's hardware.
- (B) Application Software:
Application software, on the other hand, consists of programs designed to perform specific tasks for users or organizations. Examples include word processors (e.g., Microsoft Word), spreadsheets (e.g., Microsoft Excel), and media players. These programs are not directly responsible for controlling the computer's hardware.
- (C) Microsoft Excel:
Microsoft Excel is a specific application software used for creating and managing spreadsheets. It is not a collection of programs that controls the computer.
- (D) Microsoft Word:
Microsoft Word is another specific application software used for creating and editing documents. Like Excel, it is not a collection of programs that controls the computer.
Since the question specifically asks for a collection of programs that helps control the computer, the correct answer is:
\[
\boxed{\text{(A) system software}}
\]