What was one purpose of the United Farm Workers Union? A. To improve race relations with other farmworkers
B. To encourage more immigrants to come to the United States
C. To raise the prices of agricultural crops
D. To help farmworkers achieve U.S. citizenship

to help farm workers achieve U.S. citizenship

Explanation:

-- Start a list.
-- At the beginning of the list, write zero. 
-- Next on the list, write ' 1 '.
-- Now you have the beginning of the Fibonacci series.
-- Whenever you want to add a new term to the list, sum up
     the last two terms on the list.  Their sum is the new term.