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Sinus infections happen when fluid builds up in the air-filled pockets in the face (sinuses), which allows germs to grow. Viruses cause most sinus infections, but bacteria can cause some sinus infections.
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In my opinion, i think it's D but im not sure. Hope this helped, have an amazing day :)
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Other common conditions that affect the skeletal system include: Osteoporosis: This is a disease in which the bones become fragile and prone to fracture. Leukemia: This is a cancer of the white blood cells. Osteopenia, osteitis Deformans, and osteomalacia: Similar to osteoporosis, these are other types of bone loss
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