When we want to make several planned comparisons amongst means in the same dataset, the primary reason why we use multiple comparisons is ____________.

a. to ensure that we only reject the null hypothesis at the rate of alpha

b. to maintain the rate at which we would falselyreject the null hypothesis in the longrunto what we define.

c. to gain power over not using multiple comparison procedures

d. because multiple comparison procedures are less powerful than simply doing multiple t-tests at full alpha