Question

a person who has allergies has a compromised immune system because the body’s immune system
attacks its healthy cells.
overreacts to an antigen.
steals nutrients from healthy cells.
responds to mutagens.

Explanation:

• "attacks its healthy cells" describes autoimmune diseases, not allergies.
• Allergies occur when the immune system overreacts to a normally harmless antigen (like pollen, dust). So this option matches.
• "steals nutrients from healthy cells" is not related to immune system function in allergies.
• "responds to mutagens" is about DNA - damaging agents, not allergies.

Answer:

B. overreacts to an antigen.