ANSWER: RELATED TO TASK DIFFICULTY.
EXPLANATION:
Psychologically, OPTIMAL AROUSAL refers to the level of mental stimulation which results to full maximization of learning process, physical performance (such as seen in athletes) or proper wellbeing.
However, research has established that different levels of arousal is generated for different tasks to get optimal performance. It was also established by researchers of this context that lower or optimal level of arousal is generated for difficult tasks to ensue better concentration. In the other hand, tasks with less intellectual demands generates higher levels of arousal in other to increase motivation.
The term used to refer to people who share common cultural characteristics is called <u>an ethnic group</u><u>.</u>
An ethnic group is constituted by a group of people who share a common cultural background together with a sense of identity. It is usually an inherited status based on the society where each person lives. Therefore a society is a wider social aggregate which may contain several ethnicities, as they can be formed by groups with different cultural backgrounds who coexist.
Khmer empire was centered in Cambodia which is off the coast of Thailand and southeast Asia
