Why Is It Important to Use Only the Fine Adjustment

Multiple Choice

Why is it important to use only the fine adjustment knob when using the high-power or oil immersion lenses?

A) Using the coarse adjustment knob might crack the coverslip or slide, due to the close working distance.
B) You will not be able to focus on the specimen with the coarse adjustment knob.
C) There will not be enough light on the specimen to see it, if the coarse adjustment knob is used.
D) The condenser does not function when using the coarse adjustment knob.
E) The iris diaphragm does not function when using the coarse adjustment knob.