Which of the following are rodenticides?
1. Phosalone 2. Warfarin 3. Imidacloprid 4. Zinc phosphide

Correct option is C

Rodenticides are chemicals used to control rodents.
Warfarin is an anticoagulant rodenticide. Zinc phosphide is an acute poison used against rodents.
Phosalone and imidacloprid are insecticides. Hence, correct rodenticides are warfarin and zinc phosphide. Therefore, option (c) is correct.