When implementing behavioral observation with a child client, the psychologist should be on the lookout for in which the child’s behaviors change simply because the child realizes they are being watched by the psychologist.

reactivity                                

Explanation:

Reactivity: In psychology, the term "reactivity" is described as a phenomenon that tends to occur or happen when a person ought to alter or change his or her behavior or performance due to the awareness of the person that he or she is being watched or observed by the other person. However, the changes related to this phenomenon can be a negative or a positive change and completely depends on the situation itself in which the person is being observed.

In the question above, the given statement signifies reactivity.

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.