Answer:
The correct answer is A. Transmission electron microscope
Step-by-step explanation:
Compound light microscope and dissecting microscope (options C and D) are light microscopes with relatively low resolution to observe internal cell structures. They allow to observe the size of the cells, in micrometers (μm). Electron microscopes, such as Transmission electron microscope (TEM) and Scanning electron microscope (SEM) have higher resolutions, and they permit to observe the cells with more details, in nanometers (nm). Between them, SEM has lower resolution than TEM, and it is generally used to observe the morphology and the surface of intact cells. TEM has a higher magnifying power so it can help you to observe internal organeles, details and structures inside the cell.