Answer:
C. tropical
Step-by-step explanation:
The tropical region lies near the equator. The tropical region is a fertile region having hot and moist atmosphere. These conditions are favourable for insects to thrive.
Malaria is caused in humans by an insect bite. If the insect is infected with a parasite, this parasite spreads throughout the human body through the bloodstream. This region has a dry climate and is popular for rainforests.
The demographics of a tropical region act in favour of spread of diseases.