In a biology lecture, the professor explains a mechanism by which viruses evade the host's immune response. Which of the following best describes this evasion strategy?

• A. Viruses replicate outside the host cells to avoid detection.
• B. Viruses alter their surface proteins frequently.
• C. Viruses consume antibodies to weaken the immune response.
• D. Viruses make the host cells produce substances harmful to the immune cells.

Answer: (B)