It depends. In Illinois, you're a ward of the state untill 21. -.- almost seems like you'll be in it forever...
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.
It brings patience and kindness into your relationship.
Either C) Less flooding or B) loss of habitat
The answer is b that it is B