I believe the answer is: Primary
For example, let's say take a look at normal employees at a company.
For most of them, the main reason they spend their time to do the job correctly is to obtain money/salary even though they have to spend their time being scolded by unlikable boss.
In the scenario above, we can say that money is the primary reinforcer for the target behavior
Large knowledge structures. hope this helps (:
Its becuase plants dont grow every where its only in certain rows
I'm currently working on this test, but I know for a fact that the answer is C, production of these goods was made a state monopoly :D