As per the question, <u>the most likely question a reader unaware of the scientific equipment would ask would be that 'what is a pipette and a concave slide</u>.' This is because he needs to know about what these equipment(Pipette and a Concave slide) are and their uses for understanding the procedure. Without knowing that a pipette is a small tube with an enlargement or bulb in the middle for transferring measured quantities of liquid and a concave slide is a microscopic slide used for examining comparatively thicker samples, they would not be able to either understand the process or follow it. Thus, <u>option A</u> is the correct answer.
