A music teacher had noticed that some students went to pieces during exams. He wanted to test whether this performance anxiety was different for people playing different instruments. He took groups of guitarists, drummers and pianists ( the variable labled Instruments) and measured their anxiety (the variable labeled Anxiety) during the exam. He also noted thedifficulty of exam (where the exam is rated on a continuous scale of 1 to 8). He wanted to see whether the type of instrument played affected performance anxiety when controlling for the grade of the exam. What analysis should he use?

A One-way ANOVA

B Logistic Regression

C Analysis of Covariance (ANCOVA)

D Regression