A Gasoline Distributor Wonders Whether an Individual's Income Level Influences $\alpha$

Multiple Choice

A gasoline distributor wonders whether an individual's income level influences the grade of gasoline purchased.The following is a contingency table from a random sample of 300 individuals.
Using $\alpha$ = .01,critical chi-square value is ______________.

A) 15.09
B) 7.88
C) 9.21
D) 16.81
E) 17.89