Just need an answer, no explanation

Iknow #2 is d. i just need to know why

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

How does a scientist the government? a. the scientist tells people in society what to do. b. the scientist determines the policies that the government spends money on. c. the scientist provides unbiased information to the government. d. the scientist makes laws based on his or her research results.