Hairline: either straight or widow's peak
Answer:
The correct answer is - reciprocators.
Explanation:
Most people are normally reciprocators who only cooperates only when they see others doing cooperating. People generally cooperates only if other people do the same or help in in favor of the same thing.
Lucia behavior is the opposite of the reciprocators as Lucia cooperates with others irrespective behavior of the people.
Thus, the correct answer is - reciprocators.
