I'm guessing it is probably because she drinks it so fast that she doesn't give it a chance to poison her body. He drinks so slowly so he gives it a chance to go throughout his body and kill him. That's my best guess, because I am no genius.
That answer is b) so that you can communicate effectively
Personally i think B because he says to exist is to think, meaning it is inseparable, you cannot exist if you don’t think basically
Answer: A. Leo is a dog.
Explanation: The most clearly implicit detail, is that Leo is a dog.
Answer:
That sucks. They must have been bad quality. You should get a refund