B & C in my opinion. If it asks for one— B. is what I would choose.
Well if you mean what does the controlled part of a scientific investigation, it is the part of the investigation that will be your control or your base, untouched, original, data and such.
Answer:
Convergent plate boundaries cause tsunamis
Explanation:
The breaking rocks allow the overriding plate to slip over part of the subducting plate all along the fault line. The plate movement on the ocean floor can cause a tsunami.
I got this info from Kids Science Fun. Hope this answers you question! Sorry if it is wrong.
Answer: In the United States, our borders are not yet fully guarded and the Mexicans or other cartel groups smuggle slaves into America and cause the increase in crime and death.
Explanation:
The first one is a the second one is a i think the third one is a and the last one is b