Answer:
Cumulative Rewards
Explanation:
Cumulative rewards are those that have been acquired or collected through time.
In this case, Sylvia's friendship with Sarah goes back a long time, and has rewarded Sylvia in many ways during that time. For this reason, Sylvia has developed a emotional bond with Sarah that goes beyond a transactional relationship, and prompts her to continue being friends with Sarah despite the current shortcomings of the friendship.
Korean War, 1950
U2 Crisis, may 1960
Bay of Pigs, 1961
Marshall Plan and Truman Doctrine,1947
Cuban Missile Crisis, 1962
Machu pich, Cuzco, Chan Chan, Lake titicaca
The right answer is protein. Legumes are well known for their low fat content and high protein content