Picture a simple everyday situation: someone wants to write a letter and print it out. Following what actually happens on the computer during this task points to the right category on its own.
To write the letter, the person opens a word processor and types the content directly into it. This program is what they interact with to get their specific job, writing a letter, done. That is application software at work.
Underneath all of this, the operating system is quietly managing the keyboard input, the memory being used, and the connection to the printer, but the person never directly asks the operating system to write a letter. Its role is to keep the machine running, not to perform the task itself.
Somewhere further back, a team of developers used programming tools, compilers, code editors, and debuggers, to actually build that word processor in the first place. Those tools were never meant for someone writing a letter; they were meant for building the software itself.
And if the printer later starts running low on ink, a utility tool might step in to monitor and report on that, but again, this has nothing to do with writing the letter itself.
Out of everything involved in this scenario, only the program the user directly opened and used to complete their task fits the description in the question.
Therefore, the correct answer is Application Software.