Malaria transmission via mosquitoes

Steps:

• Identify malaria as a disease caused by Plasmodium parasites transmitted through Anopheles mosquito bites.
• Evaluate options based on preventing mosquito-human contact or parasite spread.
• Eliminate choices unrelated to vectors like insects.
• Select the option that physically blocks mosquito bites.

Why C is correct:

• Mosquito nets create a barrier that prevents Anopheles mosquitoes from biting humans, directly interrupting the vector-borne transmission cycle defined by malaria epidemiology.

Why the others are wrong:

• A: Condoms prevent sexual transmission of diseases like HIV, not insect-borne ones.
• B: Antibiotics treat bacterial infections, but malaria is caused by protozoan parasites unresponsive to them.
• D: Handwashing reduces bacterial or viral spread via contact, irrelevant to mosquito vectors.

Final answer: C