Answer:
C) a transmission electronic microscope
Explanation:
The transmission electron microscope is a high quality instrument to study internal ultrastructure of cells. It uses high energy beam of electrons instead of light for the imaging of the objects. As the wavelength of electrons is less as compared to the light which gives very high resolution of the images. High resolution can be used to analyze ultrastructure of cells. Thus, the finest details of internal structure of cells can be studied.