Which option is an example of an experiment?
a. recording the reaction time of participants in a study who were
asked to press a button as soon as they see a certain picture on a
screen
o
b. testing the effect that eating organic food has on health by having
a group of people selected at random eat organic food for six
consecutive months and then comparing the results with a group
of people who didn't eat any organic foods during the same period
o
c. asking students in a school how much time they spend exercising
o
d. polling teenagers about their screen time in a day