When Carrying Out a Chi-Square Test for Independence, a Good

When carrying out a chi-square test for independence, a good check on your arithmetic in figuring the expected frequencies is to make sure that:

A) the expected frequency of each cell is no larger than the observed frequency
B) the sum of all the expected frequencies times the degrees of freedom equals the sum of all the observed frequencies
C) for each row and column, the sum of the observed frequencies and the sum of the expected frequencies come out to be the same
D) for each row, the sum of all the expected frequencies equals the observed frequencies, minus 1, for each column