20 According to the passage, which of the following statistics is NOT correct? (A) Ever since the US immigration laws replaced a national quota system in 1965, the number of immigrants living in the US has grown more than six times. (B) In 1970, immigrants accounted for 4.8% of the US population. (C) In 2017, about 23% of all immigrants were unauthorized immigrants. (D) In 2017, unauthorized immigrants in the US accounted for 3.2% of the US population.