Answer:
you have more energy through the day and more than likely you will be happy more often
the correct answer would be earthquakes because it gives us the answer right in the question by saying "a region where tectonic activity is", and in earthquakes they call the parts of the earthquake where it moves the ground apart tectonic plates.
Hope I helped.
The correct answer is - flooding.
The Hurricane Katrina was a devastating one. It had very strong winds that were very destructive, and the rainfall was also very intense, but it was not what made the biggest damage in New Orleans, instead it was the flooding of the city.
New Orleans is a city that is on a very small elevation, close to sea level, so it is very vulnerable to the sea level rising, which unfortunately did happened with the Hurricane Katrina. Because of the strong winds, and the heavy rainfall, the sea started to flood the city and destroyed big portion of it. Lots of people lost their lives, and there was also a huge material damage.
Despite there being no answers listed by you, which the problem seems to be a multiple choice type of question, I'll go ahead and take a stab here.
What this problem is describing is basic nuclear fusion. Nuclear fusion is the process of which energy is released by a combination of two elements after they form into a brand new element. Once this happens, the bonded atoms have formed into a new, heavier nucleus.