Answer:
(A). suddenly; gradually
Explanation:
A psychological or mental disorder is a condition that causes impaired mental behaviors and is characterized by unexpected cultural reactions to situations.
In <u>acute onset mental disorders, symptoms occur </u><u>suddenly</u><u>, while in insidious onset mental disorders, symptoms occur </u><u>gradually</u><u>.</u>
The subject or subjects being observed in classic naturalistic observation may be unaware that they are being observed.
The correct option is (B).
<h3>What is naturalistic observation?</h3>
Naturalistic observation is a technique for seeing subjects in their natural setting.
The goal is to observe behavior in an unaltered natural environment.
Researchers may keep track of what they see by making notes or tallies.
Thus, the correct statement is (B) Maybe unaware that observation is being conducted.
Learn more about naturalistic observation, here:
brainly.com/question/8187021
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