The coarse adjustment knob is used for large adjustments when focusing a microscope by the time ur at the high power ojective lens its lens would be close to the stage and using the course adjustment knob can cause the lens to crack or brake the slide
Think it would be C, not 100% on this.
Since you provide no options, here are the usual parts of scientific method :
- Idea / question which answer you want to find out
- Research , collecting all kinds of data
- Hypothesis , an explanation that is made at the starting point, before the experiment
- Experiment , to find out whether your hypothesis is right
- Analyze the data that you got from the experiment
- Conclusion, your final judgement based on the result of your experiment