An auto insurance company divides its customers into 4 age groups (under 26, 26-45, 46-65, over 65). It is assumed that each group is responsible for 25% of all auto crashes. A random sample of 160 car crashes was taken and it was observed that the "under 26" group was responsible for 29 accidents, the "26-45" group was responsible for 64 accidents, the "46-65" group were responsible for 48 accidents and the "over 65" group were responsible for 19 accidents. What test would be used to test the research hypothesis that the distribution of accidents has changed?

a. Chi-Square Test of Independence

b. Hypothesis test of two population proportions

c. Analysis of Variance (ANOVA)

d. Chi-Square Goodness of Fit