End- means which of the following?

• A. Within, Inside
• B. Eye
• C. Observe
• D. Stone

Answer: (A)

End- as a prefix indicates inner position, within, or inside. This is why it points to concepts like endoscopy (looking inside a hollow organ), endometrium (the inner lining of the uterus), and endocardium (the inner lining of the heart). So the choice that matches this idea—“within, inside”—is the correct one. The other options don’t fit because they refer to unrelated roots: eye uses a different root such as ocul/o or ophthalm/o; observe relates to watching rather than location; stone uses lith/o.