Migration is affected by various factors like age, sex, marital status, education, occupation, employment etc. People migrate to those places where they have better facilities of health services, educational services, transportation and communication and the life is easier.
The answer would most likely be B
Depending on what water source you use, if your using faucet water your food will be clean but not totally.
If your using a lake, ocean, bodies of water your food will not be as clean, water from bodies of water are full of bacteria, and other contaminants.That being said, using a faucet is your best bet or even try to clarify water from bodies can help.
