Respuesta :
Answer:
(A) The immune system must attack the body's own cells.
Explanation:
(Apex)
Viral infections are caused by certain viruses either by direct or indirect contact. It can be difficult to kill viral infections because of slow working macrophages, i.e., option B.
What are macrophages?
Macrophages are types of WBCs, i.e., white blood cells that are usually surrounds and kill the invaded pathogen.
Due to slow working of macrophages it can be difficult to kill the invaded pathogens, and hence make it difficult to defeat viral infections.
Thus, the correct option is B.
For more details regarding macrophages, visit:
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