The theory of plate tectonics explain the locations of

a) earthquake and the lithosphere.
b) volcanoes and the mantle.
c) the mantle and the lithosphere.
d) earthquakes and volcanoes.

D) earthquakes and volcanoes

Earthquakes occur when two tectonic plates rub together causing shockwaves. Volcanoes occur when two plates come together and push land up, allowing the molten liquid of the inner earth up to the surface.

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.