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.
The correct answer is A. luxuries
There are two categories, needs and wants. Needs are essential items that we need to survive. Wants are things that we want and are often called luxuries. You don't need them to live but you want to have them and it's useful sometimes to have them.
C i think You have to look more into it though
Filling time Interlude
Twelve Psalms Song
Son's of Korah Temple Musicians
To raise up Selah
In the title of Fifty-Seven Psalms Psalm
