With their research on the infant named Albert, Watson and Rayner demonstrated that:

a. emotions could be displaced to a stimuli other than those that had originally elicited
b. the emotions intelligence is only partially genetically
c. determined bodily structure
d. interacts with experience to produce personality

(A). Emotions could be displaced to a stimuli other than those that had originally elicited

Explanation:

John Watson and Rosalie Rayner conducted an experiment called the little Albert experiment where they monitored an infant's response to a stimuli and then tried to alter that response by introducing a different stimuli.

In the experiment, the infant (Albert) who wasn't initially scared of a furry white rat, later became scared because each time Albert touched the rat, a loud noise was made behind him.

So Albert came to associate the rat with the loud noise and learnt to fear the rat and other furry animals and objects.

This experiment showed that emotions and reactions can be induced by introducing a stimuli, different from what a person is used to.