The computer user did not know what he was doing at all, this made the instructional course pure what for him?
Options:
- energy
- office building
- hell
- school
- house
Step-by-step reasoning process below:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The instructional course was pure hell for him because he felt miserable and tormented unable to follow instructions in the course. The answer: hell.