Explanation:

The correct option is (b) utility. Utility software is a type of system software specifically designed to help analyze, configure, optimize, or maintain a computer. Its primary function is to enhance the overall ease of use and efficiency of the system by performing tasks such as disk cleanup, antivirus protection, data compression, or system diagnostics. Option (a) application software refers to programs designed for specific user tasks (e.g., word processing, web browsing) rather than general system maintenance or optimization. Option (c) network refers to a system of interconnected computers, not a type of program. Option (d) operating system is the fundamental software that manages computer hardware and software resources, but utility software *supplements* the OS to provide additional ease-of-use features. Therefore, utility software most accurately fits the description of a program that makes the computer easier to use.