Answer pls I’m dumb

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

Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.

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