Jade was asked to participate in an experiment. The experimenter read aloud to her a series of numbers that she was then asked to repeat back to him in the same order. As Jade continued to answer correctly, the lists became longer and longer until she finally could not get the numbers right. The experiment in which Jade was asked to participate involved the use of what memory test?

• A. Working memory test
• B. Echoic memory test
• C. The digit-span test
• D. Selective attention test