I believe that they are becoming more concerned for zoonotic disease because it is becoming more and more common for these animal transmitted disease to spread, such as ringworm or hookworms. The factors that would make these more of a threat would likely be the amount of people with animals or the other animals or people their animals are around or not taking your animal to the vet upon signs of seeing symptoms of declining health.
I would Say C. Because you need meat to build up your Strength
Environment, health and population are interrelated.
An abortion. It is carried out for many reasons including unwanted pregnancies, cases where the parents are too young, lack of funds to keep the baby, death of baby inside the womb etc.
