What should be changed to make the following sentence true? Spontaneous acquisition is…

What should be changed to make the following sentence true? Spontaneous acquisition is the return of a previously extinguished conditioned response.
The word “acquisition” should be changed to the word “recovery.”
The word “extinguished” should be changed to the word “acquired.”
The word “response” should be changed to the word “stimulus.”
The word “spontaneous” should be changed to the word “planned.”