I would go with the war with Somalia, because first all the other answer seem correct and the war with Somalia was a major victory for Ethiopia, they gained from it. So the answer is "war with Somalia"
By velocity, you are referring to the speed of sound. It can be modelled by the equation:
V = 331m/s + (0.6m/s/C) x T (where T stands for temperature and V stands for Velocity).
Plug in the numbers and you'll get 343m/s
C) People become unemployed and cannot get services they need.
Factories provide jobs which keeps unemployment rates down. They make thosands of jobs worldwide so, when European countries removed these factories it made the unemployment rates skyrocket.
It is a completely false statement that the top of a sedimentary layer was deposited before the bottom. The correct option among all the options that are given in the question is the second option or option "B". The top layer is always deposited later than the bottom layer. I hope the answer helps you.