Please help this is due tomorrow ​

The answer for #3 is c but i don't know why

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Avolleyball player hit a ball with a mass of 0.25 kg. the average acceleration of the ball is 15.5 m/s². how much force did the volleyball player apply to the ball? 62.0 n 3.87 n 62.0 m/s² 3.87 m/s²