How can electron-dense materials be used to differentiate between cellular components in electron microscopy?

• A. By selectively labeling components with electron-dense materials, making them appear darker in images.
• B. By embedding the entire sample in electron-dense materials to preserve its structure.
• C. By using electron-dense materials to increase the sample's overall electron density.
• D. By coating the entire sample with electron-dense materials to enhance color contrast.

Answer: (A)