Identify the type of cause for the woman cooking the meals in the following scenarios:

a) A woman believes her husband is cheating on her. She decides to poison his dinner but he calls and says he is working late. Disgusted, she puts the meal in the refrigerator. In the middle of the night, her teenage son wanders downstairs for a snack and eats the food and dies.

b) Same scenario as a except the woman awakens and stops her son after he has eaten a small portion. She calls an ambulance that takes the son to the hospital where his stomach is pumped and he is held for observation. While he is sleeping, a nurse inadvertently injects the wrong drug into his IV killing him.