When our brains store information, complicated chemical changes take place. In trying to understand these changes, researchers blocked some processes in brain cells taken from rats and compared these cells with a control group of normal cells. They say that "no differences were seen" between the two groups in four response variables. They give p-values 0.45, 0.83, 0.26, and 0.84 for these four comparisons.

Which of the following is correct?

It is literally true that "no differences were seen." That is, the mean responses were exactly alike in the two groups.
The mean responses were exactly alike in the two groups for at least one of the four response variables measured, but not for all of them.
The statement "no differences were seen" means that the observed differences were not statistically significant at the significance level used by the researchers.
The statement "no differences were seen" means that the observed differences were all less than 1 (and were actually 0.45, 0.83, 0.26 and 0.84 for these four comparisons).