George Sperling Conducted a Study in Which He Varied the Interval

George Sperling conducted a study in which he varied the interval between the presentation of a letter matrix and an auditory recall cue. Sperling measured the proportion of letters participants could recall from the matrix. Which statement regarding this study is False?

A) A graph of the results of this study would show the accuracy of recall on the y-axis.
B) The interval between the matrix and the cue is a dependent variable.
C) The function relating the accuracy of recall to the interval between the matrix and the cue is a decreasing function, asymptoting at an interval of around 1 s.
D) All of these statements are True.