What was the unconditioned stimulus (UCS) in the case of Little Albert? A high chair
A rat
A loud noise
A small enclosed space
A dog

It was started by a scientist Ivan Pavlov who was a russian physiologist who started the Behaviorist movement in psychology.

During the experiment:

The loud noise is the unconditioned stimulus.The fear reaction is the unconditioned response.The white rat is our neutral stimulus.When the loud noise and the white rat are paired over time, the white rat becomes the conditioned stimulus.The Fear reaction to the loud noise the conditioned response.

Our Answer is:

Loud noise (Option C✓)

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c= 9.28 cm

Step-by-step explanation:

c^2 =a^2 + b^2 - 2abcosC   law of cosines

c^2 = 15^2 + 21^2 - 2*15*21 * cos23

c^2=225+441-630 *.9205

combine like terms

c^2 =666 - 86.08579.92

c^2 =86.09

take the square root of each side

sqrt(c^2) = sqrt(86.09)

c = 9.28