The image shows various types of plant leaves colored in different shades of red, so it can be said that the term used to color this image was monochromatic. This term refers to the colors or shades that belong to a single color matrix, that is, they are variations of the same color. The main characteristic of color matrices is that all the colors that compose it are derived from a color, they only differ by being darker or lighter than the original. So the correct answer is C. Monochromatic.
