An experiment was done to compare the effect of having a conversation via a hands-free mobile phone, having a conversation with an in-car passenger, and no distraction (baseline) on driving accuracy. Twenty participants took part in all three conditions of the experiment (in counterbalanced order), and their driving accuracy was measured by a layperson who remained unaware of the experimental hypothesis. Which of the following would be the most appropriate method for analysing these data?

a. Two-way independent ANOVA b. Two-way mixed ANOVA c. One-way repeated-measures ANOVA d. Two-way repeated-measures ANOVA