Why Did Malaria Control Efforts in Malaysia Once Lead to Cats

Why did malaria control efforts in Malaysia once lead to cats being parachuted into affected areas?

A) Cats help to consume mosquitoes, lowering their populations.
B) Cats were needed to keep aid workers company.
C) As pesticides made their way through the food chain, cats died and rats that transmitted sylvatic plague increased in numbers.
D) As pesticides affected agricultural crops as well as pests, residents needed other sources of food.
E) Cats were needed to help consume rats that were consuming roofs of houses after a rat population explosion due to unexpected consequences of pesticide use.