That Social Security payments will be a burden comes from the concern that ______. A. elderly people ask for more money B. the program discourages working people C. the number of elderly p

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).