Question

Earth’s solid inner core is surrounded by the hot, molten metal of which layer

Answer 1

The Layers going from Top to bottom is Crust,Upper Mantle,Mantle, Outter core, inner core. Soooooo most likly its outter core

Answer 2

The layers of the Earth have the following correct order (starting from the interior of the Earth) : inner core, outer core, mantle, and crust

Earth’s solid inner core is surrounded by the hot, molten metal of the outer core. The outer core  is a fluid layer about 2,400 km (1,500 mi) thick and composed of mostly iron and nickel. It generates Earth's magnetic field.