Question: A student recorded the growth rate of plants grown in the presence of two different types of music. Plants grown in the presence of one type of music grew faster than the other plants. Before reporting a conclusion, which should the student most likely do?

What is the correct answer to the question from the following choices?
Pick from:
 a). use different plants.
 b). do the experiment again.
 c). add a third type of music.
 d). use fewer plants.
b).