After Watson combined the loud noise with presentation of the rat, Albert became afraid of the rat alone. This signifies that which type of learning had taken place?

Classical conditioning

Explanation:

In classical conditioning one person learns about things by associating them with good or bad sensuous experience that is associated with it.

In this example Albert has learned to associate rats with unpleasant loud noises as every time he sees the picture of the rat he has to hear the loud unpleasant noise. thus he is classically conditioned to see the rat unfavorably and would think   of the same terrible sound every time he sees a rat around himself.

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