The answer is C
Explanation: I looked it up
It is either 21 or 18. They have talked about lower the age to 18 but I am not sure if they did it yet or not.
Social Protection is insurance. Workers pay this insureance, usually by withdrawing salaries where they work. Per year they can earn as many as four credits. For 2020, every time anyone receives $1,410, they receive one credit before they reach $5,640, or four credits.2 The money goes into two trust funds for Social Security — the OASI Trust Fund for Retreates