A. elderly people ask for more money
B. the program discourages working people
C. the number of elderly people is growing
D. younger people do not want to work
C
Đáp án C
Giải thích: “Recently, there has been concern that the Social Security fund may not have enough money to fulfill its obligations in the 21st century (=Social Security payments will be a burden) , when the population of elderly Americans is expected to increase dramatically (= the number of elderly people is growing).
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