The correct option is A.
The serosa refers to the outermost layer of loose connective tissues which is often covered by mucus and which contains blood vessels. In the gastrol intestinal tract, the serosa refers to the outermost layer of the wall of the GI tract. One major function of serosa is to reduce friction from muscle movement.
Yes, since B and C will be pushing towards each other, it will form a mountain.
They are made from igneous, metamorphic and sedimentary rock.
Im going to guess either c or d