A Researcher Analyzed His Data Using an Independent Samples T

A researcher analyzed his data using an independent samples t test and found that the 95% confidence interval of the difference between two means ranges from -0.54 to -0.20. Which of the following is true?

A) The means for both groups must be negative.
B) Both groups have a negative association.
C) The means for both groups are not equal to one another.
D) Both groups are different from each other 95% of the time.