A Recent Study by the Centers for Disease Control and Prevention

A recent study by the Centers for Disease Control and Prevention found that birth rates for U.S.teenagers

A) are higher now than ever before.
B) are higher than every before for Caucasians,but lower for all other ethnic groups.
C) are higher than every before for African Americans,but lower for all other ethnic groups.
D) have reached historic lows for all age and ethnic groups.