【单选题】Which of the following statements regarding the chi-squared distribution is true?
选项：

A:The chi-squared distribution is skewed to the right.
B:All values of the chi-squared distribution are greater than or equal to zero.
C:The critical region for a goodness-of-fit test with k categories is χ2 > χ2α, k-1, where χ2 is the value of the test statistic.
D:All of these choices are true.