The is a learned reaction to a particular object or event.
a) unconditioned stimulus
b) conditioned stimulus
c) neutral response
d) unconditioned response
e) conditioned reponse

B. Conditioned stimulus

Explanation:

The "learning" process occurs when a certain stimulus is associated with a certain outcome.

For example, let's say that initially  a person give no reaction every time he hears the sound of a bell.

We place that person in a solitary room and suddenly surprise him with a loud sound from behind right after the sound of the bell. Over time, that person will associate the bell with the loud sound and will flinch every time He hears a bell. This is what considered to be the learned reaction.

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.

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