Randomization in an experiment is important because it ensures that
a.) the treatments have an effect on the response.
b.) the groups of subjects are similar, on average, in all respects before applying the different treatments to the different groups.
c.) each treatment is thought of as a value of the explanatory variable

C.) each treatment is thought of as a value of the explanatory variable

Step-by-step explanation:

The main purpose for using randomization in an experiment is to control the lurking variable and establish a cause and effect relationship.

If we do not control lurking, or confounding, variables, we cannot accurately establish a cause and effect relationship; this means we cannot ensure that each treatment is a value of the explanatory variable.

450 is the final answer! : )