Check each: (A) Single parent families nearly tripled since 1950, so true. (C) A fourth of 12 million infants equals 3 million, true. (D) Half of 12 million equals 6 million at risk, true. (B) The passage says foster care rose by over 50 percent in 1987 to 1991 but never states it decreased after 1991. Therefore B is not true.