In an ANOVA Test of the Differences Between the Means $\mu_{1}=\mu_{2}=\mu_{3}$

Multiple Choice

In an ANOVA test of the differences between the means of three groups,the null hypothesis is:

A) $\mu_{1}=\mu_{2}=\mu_{3}$
B) $\mu_{1} \neq \mu_{2} \neq \mu_{3}$
C) $\mu_{1}-\mu_{2}-\mu_{3}=0$
D) $\mu_{1}+\mu_{2}+\mu_{3}=1$