Answer:
Option (c).
Explanation:
DDT is a chemical that was generally used as a pesticide in the agricular fields. The initial use of DDT was to control the malaria, body lice and other harmful disease.
The African governments previously declared that long term effects of DDT were not serious as the immediate problem to control the insect. According to them, the immediate use of DDT nullify its long term bad effects.
Thus, the correct answer is option (c).