Final answer:
An electron microscope, specifically a transmission electron microscope (TEM), is necessary to view the two phospholipid layers of a plasma membrane due to its high resolution and magnification capabilities. answer B is correct .
Step-by-step explanation:
To observe the two phospholipid layers in a plasma membrane, the type of microscope required is an electron microscope. More specifically, a transmission electron microscope (TEM) is adept at visualizing structures at the molecular level, making it possible to see the bilayer of phospholipids that constitute the plasma membranes.
Unlike optical microscopes such as the darkfield, phase contrast, and brightfield microscopes which are limited by magnification and resolution, the TEM uses a beam of electrons that passes through a thinly sliced specimen. This enables it to produce highly detailed images at a much higher resolution. TEM can resolve details as small as 0.1 nm (10-10 m), allowing for magnifications that can reveal individual atoms and complex structures, including the intricate details within cell membranes.