Which term corresponds to 'Inserting into a body part'?

• A. invasive
• B. internal
• C. intact
• D. insidious

Answer: (A)

Invasive describes actions that penetrate into the body or its tissues. When something is inserted into a body part—like a needle, catheter, or instrument used during a procedure—that activity involves entering the body's tissues, which is what “invasive” communicates.

The other terms don’t fit as well. Internal simply refers to something located inside the body, not the act of entering. Intact means whole or undamaged. Insidious describes something harmful that develops gradually and stealthily, not the act of inserting into a body part.