I think it is A because they can just destroy it but D is finding something natural to kill it off but it is GM so it wouldn't help so A
Answer:
The loading dose of N-acetylcysteine is 8,700 mg (150 mg per 55 kilograms).
The complete cycle of treatment with N-acetylcysteine comprises 3 consecutive intravenous infusions, distributed as follows:
1 infusion: Initial dose of 150mg / kg of body weight in 200 ml of solution to pass in one hour.
2 infusion: 50 mg / k of weight in 500 ml of solution to pass in 4 hours
3 infusion: 100mg / kg of weight in 1000ml to pass in the following 16 hours.
The answer to your question is digestive.