Which of the Following Can Be Considered Examples of Trait

Multiple Choice

Which of the following can be considered examples of trait variation being maintained by frequency-dependent selection?
1) An aggressive strategy never works better than a non-aggressive strategy does,even if virtually 0% of individuals use the aggressive strategy
2) An aggressive strategy works better than a non-aggressive strategy does,but only if less than 10% of individuals use the aggressive strategy
3) An aggressive strategy works better than a non-aggressive strategy does,but only if less than 70% of individuals use the aggressive strategy.

A) 1 only
B) 3 only
C) 1 and 2 only
D) 2 and 3 only
E) 1,2,and 3