Question

malaria is spread by
contaminated water.
coughing.
mosquitoes.
bodily fluids.

Explanation:

Malaria is a mosquito - borne infectious disease. Mosquitoes of the genus Anopheles are the vectors that transmit the Plasmodium parasite which causes malaria. Contaminated water is more associated with diseases like cholera. Coughing is a mode of transmission for respiratory diseases such as tuberculosis. Bodily fluids are a mode of transmission for diseases like HIV/AIDS (in some cases).

Answer:

mosquitoes.