Question

which layer retains heat from the earth’s formation and is molten?
choices: asthenosphere, outer core, lower mantle

Explanation:

The outer core of the Earth is a liquid (molten) layer that retains heat from the Earth's formation. The asthenosphere is part of the upper mantle (semi - molten, but not the main layer with heat from formation in the same way), and the lower mantle is solid. So the correct option is the outer core.

Answer:

B. outer core (assuming the options are labeled as A. asthenosphere, B. outer core, C. lower mantle)