Theory is the branch of psychology that studies the perception of reality and the mental processes required to understand the world we live in?

Cognitive theory

Explanation:

Cognitive theory of cognitive psychology is the psychology that studies the internal mental process of human beings as well as animals. It includes perception, cognition, thinking, memory, learning, attention, concentration, and language, etc. It is the latest branch of psychology.

This is the helping psychology branch that helps in many disorders and in making a decision problem. To help people from recovery in head brain injury.

Thus here in the above context, it talks about the cognitive psychology that deals in cognition or mental process of people.  

disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.