In a High School Laboratory, Which of the Following Constitutes

Multiple Choice

In a high school laboratory, which of the following constitutes an experiment?
I.learning to use a microscope by examining fixed specimens on slides
II.being able to examine swimming protists under a microscope
III.extracting pigments from plant leaves and separating the types of pigments for identification
IV.preparing root tips for examination by staining them

A) I only
B) II only
C) III only
D) II and III only
E) II, III, and IV