<span>Periodic flooding of the river caused a great deal of death and destruction.</span>
Whenever you give a fact it looks better and more smart to show where you got the fact so it can be in the first paragraph last paragraph etc anywhere you give facts you should cite your sources so the information is more trusted and looks better . Hope this helps ! (:
C is the correct answer for this question. Guilt can hide what people want to do and prevent them from doing it ever again.