I guess having night blindness would affect a person's activities in a negative way. This person would have to take special care about what he or she is doing, given that they vision is heavily impaired. For example, they shouldn't be allowed to drive at night given that they might put themselves and others in danger.
It's C The government and the private sector both play a significant role.
The First crusade involved Western Europe
A - only having one sex partner at a time.
No other answer comes close to being correct. Most modern-day societies are practicing monogamy as the main type of relationship between two people.
Search the actua internet like Safari or Google. Or even better you can just read the book