i think the answer may be blood diamonds
If AE is x+50 then the whole thing must be x=50, If a portion of that, CE, is x+32, then the rest of it, AC, must be x+18, because no matter what X is, 32+18=50.
Hopes this helps mate :)
Answer:
I believe that the answer is A, Lowering the population to protect resources and the environment.
B. Crystal size is a function of cooling time. The longer a melt cools the larger the crystals.