ANS:B - Software tool

Software tool : is a programming tool or software development tool which is used to create, debug, maintain, or support other programs and applications.

System software : is a type of computer program that is designed to run a computer's hardware and application programs, such as the operating system, file management utilities, and disk operating system (or DOS).

Utility program : is one part of the Operating systems for carrying out a routine function. It is a program that performs a very specific task, usually related to managing system resources, Operating systems contain a number of utility programs for managing disk drives, printers, and other devices.

Applications program (also called end-user programs) : includes a database programs, word processors, Web browsers and spreadsheets.

Now the Answer is clear.