The source of Albert's fear was "A White Rat".
This was a famous experiment by John Watson and Rosalie Rayner for which they received much criticism. The child whose name was "Albert" but is famously known as "Little Albert" moved shortly after the experiment so it was a mystery what happened to him until recently when he was found as “<span>Douglas Merritte” who died before he was found.</span>
The answer is d. services.
The other three are all factors of production. You need land or a place to create your goods
and services. You have to have capital
to run your production and sustain it.
Then you need labor or people who will produce the goods and services
that you are going to sell.
