Watson and Kidd's Studies on the Effects of Learning and Memory

Watson and Kidd's studies on the effects of learning and memory in auditory perception have shown that:

A) With practice, people become better at detecting subtle details of complex auditory sounds.
B) People are better at detecting differences across complex auditory sequences than across isolated tones.
C) People are better at detecting subtle details of complex auditory sounds when they are new.
D) Central processes are rarely used to detect subtle details of complex auditory sounds.