Answer:
The researcher is most likely studying C. absolute threshold.
Explanation:
Threshold refers a specific intensity which needs to be exceeded in order to <em>obtain a certain reaction</em>. For example, pain threshold.
The absolute threshold refers to the smallest change in a <em>stimulus' intensity</em> in order to be <em>identified by the senses</em>, such as hearing, vision, etc.
In this case, a <em>change in tones requires a low intensity</em>, meaning an almost subtle change can be easily identified by the human sense. It is most likely the researcher is studying your absolute threshold.
Julius Caesar created a dictatorship.....!
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He was born January 20, 1716
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