That Social Security payments will be a burden comes from the

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That Social Security payments will be a burden comes from the concern that ______.

elderly people ask for more money

the program discourages working people

the number of elderly people is growing

younger people do not want to work

Giải thích

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).