The correct answer is "Kinsey collected data with personal interviews; Masters and Johnson recorded measurements of physiological variables." Dr. Alfred C. Kinsey is famous for all the research he did regarding sexuality, gender and reproductive behavior; he liked to collect the data by performing interviews personally. The method of interview of Kinsey is so widely know that there is a "Kinsey Interview Kit" for researchers in sexuality. On the other hand, William Masters and Virginia Johnson performed they researchers by studying physiological variables instead.
