The lithosphere is a rigid layer made of earth's entire crust and the very top part of earth's mantle. this rigid layer is divided into several large pieces, or plates. the lithospheric plates float on top of the which is a weak part of the mantle that flows slowly..

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

the answer is d. none of the above