Which type of soil is most likely to be found in horizon e?
a. a layer of bedrock
b. a layer of decayed plant matter
c. a layer of parent material
d. a layer of pale, sandy soil lacking clay and iron

D. A layer of pale, sandy soil lacking clay and iron

Explanation:

The soil is complex, composed of multiple layers/horizons all of which have different characteristic that make every horizon  to have its own special role in it. The horizon E is the third horizon from the top. This horizon is characterized by being mostly sandy, and because the water manages to go through it very easily it is a horizon in which there's heavy leaching going on. Because of the leaching, this horizon loses the clay, iron, and aluminium from it, thus they accumulate in the horizon below it. As a horizon it is very important, especially for the trees, as their root systems manage to develop very well in this horizon because it is loos and sandy.

the electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, x-rays, and gamma-rays.