Final answer:
Anatomy's three main areas of study are gross anatomy (larger structures seen without magnification), microscopic anatomy (structures requiring a microscope to be seen), and functional anatomy (how anatomical structures function). So the correct option is B.
Step-by-step explanation:
The three main areas of study within anatomy are gross anatomy, microscopic anatomy, and functional anatomy. Gross anatomy, also known as macroscopic anatomy, involves the study of larger structures of the body that are visible without magnification, such as the brain. Microscopic anatomy, which includes cytology and histology, is the study of structures that are so small they can only be seen with a microscope. Functional anatomy explores how anatomical structures function, often requiring knowledge of both gross and microscopic anatomy to provide a comprehensive understanding of how the body works.