Final answer:
The rodenticide that can depress clotting factors for 3-4 weeks is Warfarin.
Step-by-step explanation:
The rodenticide that can depress clotting factors for 3-4 weeks is B. Warfarin.
Warfarin is an anticoagulant that works by inhibiting the synthesis of vitamin K-dependent clotting factors, leading to prolonged bleeding and preventing the formation of blood clots.
For example, if a rodent ingests warfarin, it can take several days for the clotting factors to decrease, and the effects can last for weeks.