The characteristics of two layers of Earth’s crust are listed. Layer A: Made of iron and nickel and responsible for Earth’s magnetic field
Layer B: Made mostly of solid iron

Which statement is true?

Layer A is the crust and Layer B is the mantle.
Layer A is the mantle and Layer B is the crust.
Layer A is the outer core and Layer B is the inner core.
Layer A is the inner core and Layer B is the outer core.
Fossil A
Fossil B
Fossil C
Fossil D