Urbanization is more than the growth of cities. it represents a change in economic, social, and
a. political thinking.
b. healthful thinking.
c. personal thinking.
d. religious thinking.

I believe it would be A. Political thinking. Hope it helps! :)

c.

Step-by-step explanation:

i know because of a test im doing online right now.

Try, please, this:
1) Imagine, that pharmacist used 'x' gr. of 40% solution and 'y' of 70% solution.
Together (20 gr. of 52% sol.) it will be x+y=20.
2) From other side, the pharmacist combined 40x and 70y gramms, after obtaining together it is 52(x+y) gramms. In other words 40x+70y=52(x+y)
3) 

8 gr. of 70% solution and 12 gr. of 40%.