Identify the process illustrated. Rent. (From Latin reddita, meaning things that are returned.) Rente, the French original of rent, meant income. The English meaning is income from property. amelioration pejoration generalization specialization
We can immediately reject two of the answers: "ameliaration" and "pejoration" as they mean that something has a better (the first) or a worse (the second) meaning -but this is not the case here.
Now, the trend is: something returned>>income>> income from rent
as you see, it has a more and more specialised meaning - the answer is "specialization"